oo General Description The BO8M04, B14M04, B20M04, B25M04 and B38M04 displays are 4 digit seven segment LED displays combined with a 4 digit, direct drive, integrated circuit. The devices are available in high efficiency red, green and yellow colour variants. Fach of the standard displays has a right hand decimal point in each digit (except the BO8M04) whereas the -CL variant has colons for clock applications. LED sizes include 8mm (0.3 inch), 14mm (0.56inch), 20mm (0.8inch) 25mm (linch) and 38mm (1.5inch) display areas. The on board driver chip has a serial input format that features serial data, clock and chip enable. A single 5 volt supply is standard although the unit will work with vdd as high as 10 volts. The serial bus signals interface is HCMOS compatible. The data is sent as 36 bits of segment information a logic 1 driving the segment on. This enables standard numeric plus a wide variety ~ of special characters to be generated. Both the normal and the clock variant have 2 spare outputs that can be used for driving external annunciator LED's. The LED current is programmed via an on board resistor (user alterable) to 15mA per segment. Configuration Dimensions Dim | B08 | Bl4 | B20 | B25 | B38 FRONT VIEW (mm) A 58.5 | 58.5 | 75.0 | 97.0 | 121.0 f"b [ c B |254}254|254 }254 [254 eye | D Doa0000o0 0 Cc 8.0 14.0 | 20.0 | 25.0 | 38.0 ] BxOxXMO4 a RB D 32.0 | 35.0 | 36.0 | 42.0 | 52.0 Digit 1 Digit 2" Digit 3 igit 4 ght Digit e Digits Digit E {515 151.5 |68.5 |90.0 | 115.5 _ Depth | 16.0 | 16.0 | 18.0 | 18.0 | 18.0 sf ackiteg OP ag ESE Ve Brightness Anl An2 Ce IMPORTANT NOTE: Links must be fitted in the brightness and the Vled pins (link AB and CD) if the internal brightness resistor and the Vdd led source are to be used. Eee Data sry Clock Vdd Brt 0V Ved Vied Nexus Machines Ltd reserves the right to alter or withdraw the product specification and characteristics without prior notice at any time in line with product development. Nexus Machines Ltd sole and exclusive warranty is that stated in the warranty article of the conditions of sale. Although every effort is made to ensure this data is accurate no Hability is accepted for errors or omissions that may affect the end product. 1Electrical Characteristics Parameter Min Typ Max Units Conditions Supply voltage 4.75 5.0 10 Vv Voltage on output drivers 11 Vv Power supply current 7 mA Excluding loads Input voltage logic 0 (VL) -0.3 0.8 Vv Vec=5.0 volts Input voltage logic 1 (VH) 2.2 Vdd Vv Vec=5.0 volts Input voltage logic 1 (VH) Vdd-2v Vdd Vv Vee>5.25 volts Brightness input 0 0.75 mA Output sink current (seg off) 10 uA Vout=3 volts Output sink current (seg on) 0 10 uA I brightness = OuA Output sink current (seg on) 2 4 mA I brightness = 100uA Output sink current (seg on) 15 25 mA I brightness = 750uA Brightness input voltage 3 4.3 volts I brighmess =750ma Output matching +- 20 % Clock input frequency 500 Khz Vec = 5 volts Clock High time 950 ns tr = tf = 20ns Clock Low time 950 ns Data input set up time 300 ns Data input hold time 300 ns Data enable input setup time 100 ns Operating temperature 0 70 deg C V+ = Vied = 5v LED Driver Bus Timing 1 Ie ce | | jt] |t2] 36 clocks total DTT LI LI- LI LI LI LT LU I lta typical timmg LED driver bus Nexus Machines Ltd reserves the right to alter or withdraw the product specification and characteristics without prior notice at any time in line with product development. Nexus Machines Ltd sole and exclusive warranty is that stated in the warranty article of the conditions of sale. Although every effort is made to ensure this data is accurate no liability is accepted for errors or omissions that may affect the end product. 2Pin Functions Annunciator 1 Pin 1 Provides a spare LED drive output for external LED annunciator. Capable of sinking 20mA this pin should be connected to the cathode of the LED with the anode connected to the VLED pin voltage. It is connected to the 33rd segment driver pin. Annunciator 2 Pin 2 Provides a spare LED drive output for external LED annunciator. Capable of sinking 20mA this pin should be connected to the cathode of the LED with the anode connected to the VLED pin voltage. It is connected to the 34th segment driver pin. Chip enable Pin 3 This pin provides the data enable that when active low allows the data on the data pin to be clocked into the internal registers. When this pin goes high no data can be received. Serial Data Pin 4 Segment data is sent to the device via this pin. A logic 1 tums on the segment corresponding to that data bit. A full listing of segment vs data bit is outlined below. Serial Clock Pin 5 The serial clock pin clocks the data into the device on the rising edge of the clock waveform. Note that there are 36 clocks required to clock all of the data. VDD Pin 6 The positive supply voltage. Usually connected to +5 volts Brightness Pin 7 A resistor on this pin provides a current that is multiplied 20 times and provides the segment drive level. A resistor is provided on the board that can be linked in or an external resistor used if required. Note the segment current must not exceed 20mA. 0 volts Pin 8 Power and signal ground. Note that all of the segment current must flow through this pin and so it should be connected to the power supply star point. VLed Pin 9 Supply voltage for the LED's. This is normally linked to the Vcc line but can be used to remove power from the LED displays. Bit (clock) number vs segment connectivity. Bit 0 | start | Bit9 {| A2 Bit 17 | A3 Bit 25 | A4 Bit 33 | AN1 Bit 1 | Al Bit 10 | B2 Bit 18 | B3 Bit 26 | B4 Bit 34 | AN2 Bit 2 | Bl Bit 11 | C2 Bit 19 | C3 Bit 27 | C4 Bit 35 | Null Bit3 | Cl Bit 12} D2 | Bit20 | D3 Bit 28 | D4 Bit 4 | DI Bit 13 | E2 Bit 21 | E3 Bit 29 | E4 Bit 5 | El Bit 14 | F2 Bit 22 | F3 Bit 30 | F4 Bit 6 | Fl Bit 15 |G2__{ Bit23 | G3 Bit 31 | G4 Bit7|G1 | Bit16 | dp2_| Bit 24 [dp3 | Bit32 | dp4 Bit 8 | dpl Nexus Machines Ltd reserves the right to alter or withdraw the product specification and characteristics without prior nolice at any time in ime with product development. Nexus Machines Ltd sole and exclusive warranty is that stated in the warranty article of the conditions of sale. Although every effort is made to ensure this data is accurate no liability is accepted for errors or omissions that may affect the end product. 3Typical Applications Simple 4 digit display to microcontroller interface. Digit | | Digit Digit Digit 0 1 2 3 1OQOQOOOCODO cc vec fF P1P2P3 Microcontroller Annunciators Driving a pair of 4 digit displays from a common data and clock Digit | | Digit | | Digit Digit 0 1 2 3 19Q OOOOO ge CC + P4 T | | Microcontroller P1 Annunciators Pp? P3 OO OOOO < Digit | | Digit Digit Digit 0 1 2 3 Nexus Machines Ltd reserves the right to alter or withdraw the product specification and characteristics without prior notice at any time in line with product development. Nexus Machines Ltd sole and exclusive warranty is that stated in the warranty article of the conditions of sale. Although every effort is made to ensure this data is accurate no liability is accepted for errors or omissions that may affect the end product. 4Part numbers LED brightness Min/Typ (mCd) Colour 0.3inch 0.56inch 0.8inch * 1.0inch 1.50inch Green 0.6 / 1.65 [0.9 /2.4 1.0 / 2.55 1.3/3.3 1.3/3.6 HE Red 06 / 18 |0.9 /2.4 1.0/ 2.55 1.4/3.6 1.4/3.6 Yellow 0.6 /16 10.9 /2.4 1.0 / 2.55 1.3/3.2 1.3/3.2 Colour LED size Manufacturers code Green 8mm (0.3") BO08M04N-G HE red 8mm (0.3") BO8M04N-R Yellow 8mm (0.3") BOSM04N-Y Green 14mm(0.56") | B14dM04N-G HE red 14mm(0.56") | B14M04N-R Yellow 14mm(0.56") | B14M04N-Y Green 20mm(0.8") B20M04N-G HE red 20mm(0.8") B20M04N-R Yellow 20mm(0.8") B20M04N-Y Green 20mm(0.8") B20M04CL-G HE red 20mm(0.8") B20M04CL-R Yellow 20mm(0.8") B20M04CL-Y Green 25mm (1.0") | B25M04N-G HE red 25mm (1.0") _| B2S5M04N-R Yellow 25mm (1.0") | B25M04N-Y Green 25mm (1.0") | B25M04CL-G HE red 25mm (1.0") _| B25M04CL-R Yellow 25mm (1.0") _| B25M04CL-Y Green 38mm (1.5") | B38M04N-G HE red 38mm (1.5") | B38M04N-R Yellow 38mm (1.5") _| B38M04N-Y Green 38mm (1.5") _ | B38M04CL-G HE red 38mm (1.5") | B38M04CL-R Yellow 38mm (1.5") _ | B38M04CL-Y Nexus Machines Ltd White Swan House 60 High Street Email: sales@nexusmachines.com Godstone Surrey RH9 8LW Web: www.nexusmachines.com Nexus Machines Ltd reserves the right to alter or withdraw the product specification and characteristics without prior notice at any time in line with product development. Nexus Machines Ltd sole and exclusive warranty is thar stated in the warranty article of the conditions of sale. Although every effort is made to ensure this data is accurate no liability is accepted for errors or omissions that may affect the end product. 5General Description The MMS5450 and MM5451 are monolithic MOS integrated circuits utilizing N-channel metal-gate low threshold, en- hancement mode, and ion-implanted depletion mode devic- es. They are available in 40-pin molded or cavity dual-in-line packages. The MM5450/MMS5451 is designed to drive com- mon anode-separate cathode LED displays. A single pin controls the LED display brightness by setting a reference current through a variable resistor connected to Vop. (VY national Semiconductor MM5450/MM5451 LED Display Drivers Features ac a a N Serial data input Enable (on MM5450) m@ Wide power supply operation @ TTL compatibility @ 34 or 35 outputs, 15 mA sink capability m@ Alphanumeric capability February 1995 ontinuous brightness control lo load signal required COPS is a trademark at Nalional Semiconductor Corporation. Applications m 84, DIP goad = ore m COPS or microprocessor displays ocket = @ Industrial control indicator @ Relay driver m Digital clock, thermometer, counter, voltmeter m Instrumentation readouts Block Diagram Yoo QUTPUT 34 OUTPUT I BRIGHTNESS [ Toor ae CONTROL | 2 " v2 24 18 > > i? + . 100k = 19 TYP + 35 OUTPUT BUFFERS LOAD (MM5450) 23 35 LATCHES OUTPUT 35 (M5451) SERIAL > 35-BIT SHIFT REGISTER CLOCK > a on t - TUF/6136~1 FIGURE 1 1995 National Semiconductor Corporation -TL/F/6136 RRD-B30M! 05/Printed in U.S. A. suaauig Aejdsiq G31 LSPSINW/OSPSAINAbsolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributers fer availability and specifications. Power Dissipation at + 25C Molded DIP Package, Board Mount 2.5W* Molded DIP Package, Socket Mount 2.3W** Voltage at Any Pin Vsg 0.3V toVss + 12V Molded DIP Package board mount, @jq = 49C/W, Operating Temperature 25C to +85C Derate 20.4 mW/C above 25C. **Molded DIP Package, socket mount, @ya = 54C/W, ~ 65 + , , Storage Temperature 65C to + 150C Derate 18.5 mW/C above 25C. Junction Temperature + 150C Lead Temperature (Soldering, 10 sec.) 300C Electrical Characteristics Ta within operating range, Vop = 4.75V to 11.0V, Vgg = OV unless otherwise specified Parameter Conditions Min Typ Max Units Power Supply 4.75 W v Power Supply Current Excluding Output Loads 7 mA Input Voltages Logical 0 Level (V,)} +10 pA Input Blas ~0.3 0.8 v Logical 1" Level (V4) 4.75V < Vpop < 5.25V 2.2 Vop Vv Vop > 5.25V Vop 2V Vpp Vv Brightness Input (Note 2) 0 0.75 mA Output Sink Current Segment OFF Vout = 3.0V 10 BA Segment ON Vour = 1V (Note3) LG Brightness Input = 0 pA 0 10 pA Brightness Input = 100 pA 2.0 2.7 4 mA Brightness Input = 750 pA 18 25 mA Brightness Input Voltage (Pin 19) Input Current 750 pA 3.0 4.3 v Output Matching (Note 1) +20 % Clock Input (Notes 5 and 6} Frequency, fc 500 kHz High Time, t, 950 ns Low Time, t, 950 ns Data Input Set-Up Time, tos 300 ns Hold Time, ton 300 ns Data Enable Input Set-Up Time, toes 100 ns Note 1: Output matching is calculated as the percent variation (Max + Iin)/2. Note 2: With a fixed resistor an the brightness input pin, some variation in brightness will occur from one device to another. Madmum brightness input current can be 2 mA as long as Note 3 and junction temperature equation are complied with. Note 3: See Figures , 6, and 7 tor Racammended Operating Conditions and limits. Absolute maximum tor each autput should be limited to 40 mA, Note 4: The Vout voltage should be regulated by the user. See Figures 6 and 7 for allowable Vout vs four operation. Note 5: AC input wavefarm specification for test purpose: t, < 20 ns, tf < 20 ns, f = 500 kHz, 50% +10% duty cycle. Note 6: Clock input rise and fall times must not exceed 300 ns. Connection Diagrams Dual-In-Line Package Yn E OuTreT wT in oureer wt 7 2 ourrer ot in DUTFUT BIT 16 nnd ee OUTHMT BIT 2m OVTPYT G7 15 y kag OUTreT BIT 71 DUTPUT BIT wy rd QUTPYT SIT 22 QaTPT aT 13 Prose OUEPYT BIT 23. ovTrer aT 1z24 1M UUTPUT NT 2a BUTDHT OT wat] ss OUTHET OY 28 avTPUt ert 19 t Lt pureur air 26 wwrut wre =) oureur ir 27 mses * OUuTRUT NT a rn DUTPMT BIT 29 QUTPUT HIT 7 4 OUTPUT RIT Es eure HT Ltt gurPey sit 20 AUTPOT ST 5 ey am Outret wy a aureT its 4 2 ourrar wr a2 ourruc aT 34 Es OUTPET AIT 13 OUTRUT HT 2 m2 at OUTFET aT 34 ever art 4 2h 13) Tt WHIGNTWESS CONTROL p= an Tain p04 b clock in TL/F 6136-2 Top View FIGURE 2a Dual-In-Line Package is4 LAS oureur sir is QATPUT BIT 1F ong Le oureut mitts output air wy ie oureuy eit 20 ourpur mit is 4 pane UTPUT BIT 21 OUTPUT BIT 14 won Pe oureut ait 2 ovreuy eirig4 2) oureus airaa oureut ar i2 eS ourpur ar z4 QUTAUT BIT 11 ef Le gureuy iris QSTPRT BIT 15 mond ae BUTE YT BIT ZU eurur nts 3) ourpyr ura? " wares # sure ara Pa butrut wince euTpUT BT 7 S ourput arr2a surruT ere a ourpuT nite output wits 4] output wir a1 OUTPUT BIT 4 44 GUIFUT BIT IZ aurea ata a4 p Ourrut mir 33 ourper air) od LS ourvur aire surrur wr 9 i OUTPUT MIT 35 URIGHTAESS CONTROL = Lo onTa a voo4 cLockin TUF/6136-3 Top View FIGURE 2b Order Number MM5450N, MM5451N, MM5450V or MM5451V See NS Package Number N40A or V44A 2Connection Diagrams (Continueg) OUTPLT BIT 14 OUTPUT BIT 15 Plastic Chip Carrier OUTPUT BIT 16 OUTPUT BIT 17 OUTPUT BIT 1B 2 |- output BIT 19 OQUTPLT BIT 20 ss N/C QUTPUT BIT 21 OUTPUT BIT 22 OUTPUT BIT 13 47 39 f OUTPUT BIT 23 OUTPUT BIT 12-48 38 f OUTPUT BIT 24 OUIPUT BIT 1149 37 = OUTPUT BIT 25 OUTPUT BIF 10 4 10 36 F OUTPUT BIT 26 QUTPUT BIT 9-444 35; OUTPUT BIT 27 N/Cmt12 MMS450V 34 N/C OUTPUT BIT 8413 33} OUTPUT BIT 28 OUTPUT BIT 7 $14 32 f= OUTPUT BIT 29 OUTPUT BIT 6 415 31 OUTPUT BIT 30 QUTPUT BIT SJi6 30 f OUTPUT BIT 31 OUTPUT BT 29 (7 29h OUTPUT BIT 32 18 19 20 21 22 23 24 25 26 27 28 . PrrR?E? Pp trrer Piog sgetgas ama eo = =z s @lf@eere eee = a i= ERR, EEE wn < seg 3 8 = Qa = a Top View Plastic Chip Carrier ~ wo OR aonoe w - Fr Ee Fe - NN ON EEREEE EFeEEEE anaDoa oe w@ qaoqaomwwuw ws S555 S555 5 EERE LSE BEES eaazg2axvzraagaa2 QUTPUT BIT 13 OUTPUT BIT 12 OUTPUT BIT 1t OUTPUT BIT 10 Pp OUTPUT BIT 23 OUTPUT BIT 24 OUTPUT BIT 25 OUTPUT BIT 26 P OUTPUT BIT 27 NSC P~ OUTPUT BIT 28 Pp OUTPUT BIT 29 p OUTPUT BIT 30 OUTPUT BIT 31 p- OUTPUT BIT 32 N/C12 MM5451V ue OUTPUT BM 8413 33 OUTPUT at 7414 32 OUTPUT BT 6415 Fy OUTPUT BIT 5 fis 30 OUTPUT BH 4 17 23 18 19 20 21 22 23 24 25 26 27 28 Perret tT? tty anes BOZEn * BEEE* > xeeee S55 z oR 2 8G 2 E S 3 555 EEE, EEE oo 38 w za > sa = aoa g S Tap View TL/F/6136~-13 TL/F/6136~-14Functional Description Both the MM5450 and the MMS5451 are specifically de- signed to operate 4- or 5-digit alphanumeric displays with minimal interface with the display and the data source. Seri- al data transfer from the data source to the display driver is accomplished with 2 signals, serial data and clock. Using a format of a leading 1 followed by the 35 data bits allows data transfer without an additional load signal. The 35 data bits are latched after the 36th bit is complete, thus providing non-multiplexed, direct drive to the display. Outputs change only if the serial data bits differ from the previous time. Dis- play brightness is determined by control of the output cur- rent for LED displays. A 0.001 capacitor should be connect- ed to brightness control, pin 19, to prevent possible oscilla- tions. A block diagram is shown in Figure 7. For the MM5450 a DATA ENABLE is used instead of the 35th output. The DATA ENABLE input is a metal option for the MM5450. The output current is typically 20 times greater than the current into pin 19, which is set by an external variable resistor. There is an internal limiting resistor of 4009 nominal vaiue. Figure 4 shows the input data format. A start bit of logical 1"" precedes the 35 bits of data. At the 36th clock aLOAD signal is generated synchronously with the high state of the clock, which loads the 35 bits of the shift registers into the latches. At the low state of the clock a RESET signal is generated which clears alt the shift registers for the next set of data. The shift registers are static master-slave configura- tion. There is no clear for the master portion of the first shift register, thus allowing continuous operation. There must be a complete set of 36 clocks or the shift regis- ters will not clear. When the chip first powers ON an internal power ON reset signal is generated which resets all registers and all latches. The START bit and the first clock return the chip to its nor- mal operation. Figure 2 shows the pin-out of the MM5450 and MM5451. Bit 1 is the first bit folowing the start bit and it will appear on pin 18. A logical 1 at the input will turn on the appropriate LED. Figure 3 shows the timing relationships between data, clock and OATA ENABLE. A max clock frequency of 0.5 MHZz is assumed. For applications where a lesser number of outputs are used, it is possible to either increase the current per output, or operate the part at higher than 1V Voyr. The following equation can be used for calculations. Tj = (Vout) (LED) (No. of segments)(@ya) + Ta where: Tj = junction temperature, 150C max . Vout = the voltage at the LED driver outputs lLED = the LED current Oja = thermal coefficient of the package Ta = ambient temperature 85a (Socket Mount) = 54C/W 844 (Board Mount) = 49C/W The above equation was used to plot Figure 5, Figure 6 and Figure 7. th ton bm u t cLock # 90% M A 10% DATA vu Re Hes RE OATA ENABLE (MM5450) vu toes: TL/F/6196-4 FIGURE 3Functional Description (continuea) . 1 36 START BIT 34 BIT 35 OTT] on enn one DATA a wed ./ ONTERNAL) rt RESET 1 (INTERNAL TL/F/6136-5 FIGURE 4. Input Data Format Typical Performance Characteristics 25 25 110 ~ 34 SEGMENTS Ae max) 100 Vour=! Ty 85C Your = 1 ! 90 20 PD 20 . < : NS mA/ SEGMENT 5 a = 2, zr Vout = 1.8 5 ww B18 a, = 7 ah a 1 My a z 13 SOR 2 = oo s NON ~ NS 5 3 50 Your ~2v 2 N SONS 210 = 10 }--> SAFE OPERATING z & NO) AREA 5 0 NS Ny as 2 05 S . - 20 , ' qs, . y SS ' 4 I so 0 > Se 6 4 30 ww 2 mw 2 0 5 WH 2 2 3 46 Q a 8 8 8 1M ILep (mal NUMBER UF SEGMENTS TEMPERATURE (C) TL/F/6136-7 TUF/6136-8 TL/F/6136-6 FIGURE 6 FIGURE 7 FIGURE 5 Typical Applications , RAW DC Nv ney 1M317 22400 tk , av < 4 q ' i] uaz 2N2907 he-I 2 s * nN 49 mMs450 FF TL/F/6136-9 FIGURE 8. Typical Application of Constant Current Brightness Control sv cr, coapas MM7aHCI2a Ig (Vea) Netryt I C3 TL/F/6136-10 FIGURE 9. Brightness Control Varying the Duty CycleTypical Applications (continued) Basic Electronically Tuned Radio System LED DISPLAY UE TY wi LI_ILI A a MM5450 DISPLAY DRIVER SAA KEYSOARD v cops ELECTRONIC TUNING CONTAGLLER - - a PLL SYNTHESIZER I1h STATION DETECT, ETC. Duplexing 8 Digits with One MM5450 Viep = 36 Yio i il 23,49 Bok] MMS458 way 20 Hl CLOCK DN Pn DATA PR et BRIGHTNESS CONTROL 10% TYP Yoo iJ 3 v7) TL/F/6196-11 cEp = 2.0% TUF/6196-12Physical Dimensions inches (millimeters) 2.063-2.070 . (ST s0-22 sey , p [pel [ra Est _ faa) _fes]_ [22] (79) 0.082 (1.675) RAD 9,550 10.005 413.976 20.127) PIN NG. 1 TENT: ase } 9. (4.71 oa 0.058 Min | =z, 76a 0000-1578 ri Ke O.125-0.165 (18240-18748) VP 3.1784.101) | } 0.945-5.219 5-F3981 oetss* [__0.009-0.015 7 p+ 7 egag R028 rez a7at) Tye jbo 0916 0.078 20.018 | 0.108 4014 0.418 30,003 0.508) ct S08 20.587 (0.457 20.078) min }/} (rsars 15) (130520387) (2.560 4.254) (0487 20.076) 0.125-0.140 B06-3.588) 0a a Molded Dual-In-Line Package (N) Order Number MM5450N or MM5451N NS Package Number N40A