fax id: 7018 2841T CY74FCT16841T CY74FCT162841T 20-Bit Latch Features * Reduced system switching noise * Typical VOLP (ground bounce) <0.6V at VCC = 5V, TA= 25C * Low power, pin-compatible replacement for ABT functions * FCT-C speed at 5.5 ns * Power-off disable outputs permits live insertion * Edge-rate control circuitry for significantly improved noise characteristics * Typical output skew < 250 ps * ESD > 2000V * TSSOP (19.6-mil pitch) and SSOP (25-mil pitch) packages * Industrial temperature range of -40C to +85C * VCC = 5V 10% Functional Description The CY74FCT16841T and CY74FCT162841T are 20-bit D-type latches designed for use in bus applications requiring high speed and low power. These devices can be used as two independent 10-bit latches, or as a single 10-bit latch, or as a single 20-bit latch by connecting the Output Enable (OE) and Latch (LE) inputs. Flow-through pinout and small shrink packaging aid in simplifying board layout. The output buffers are designed with a power-off disable feature to allow live insertion of boards. The CY74FCT16841T is ideally suited for driving high-capacitance loads and low-impedance backplanes. CY74FCT16841T Features: * 64 mA sink current, 32 mA source current * Typical VOLP (ground bounce) <1.0V at VCC = 5V, TA = 25C The CY74FCT162841T has 24-mA balanced output drivers with current limiting resistors in the outputs. This reduces the need for external terminating resistors and provides for minimal undershoot and reduced ground bounce. The CY74FCT162841T is ideal for driving transmission lines. CY74FCT162841T Features: * Balanced 24 mA output drivers Logic Block Diagrams Pin Configuration SSOP/TSSOP Top View 1 OE 1 LE 1 D1 D 1 Q1 C 1 OE 1 56 1 LE 1 Q1 2 55 1 D1 1 Q2 GND 3 4 54 53 1 Q3 5 52 1 Q4 6 51 1 D4 VCC 7 50 VCC 1 Q5 8 49 1 D5 1 Q6 9 48 1 D6 10 47 1 D7 GND 11 46 GND 1 Q8 12 45 1 D8 1 Q9 13 44 1 D9 1 Q10 14 43 1 D10 2 Q1 15 42 2 D1 2 Q2 16 41 2 D2 2 Q3 17 40 2 D3 GND 18 39 2 Q4 19 38 GND 2 D4 2 Q5 20 37 2 D5 2 Q6 21 36 2 D6 VCC 2 Q7 22 35 VCC 23 34 2 D7 2 Q8 24 33 2 D8 GND 2 Q9 25 32 GND 26 31 2 D9 2 Q10 27 30 2 D10 2 OE 28 29 2 LE 1 Q7 TO 9 OTHER CHANNELS FCT16841-1 2 OE 2 LE 2 D1 D 2 Q1 C TO 9 OTHER CHANNELS FCT16841-2 1 D2 GND 1 D3 FCT16841-3 Cypress Semiconductor Corporation * 3901 North First Street * San Jose * CA 95134 * 408-943-2600 July 1994 - Revised October 30, 1997 CY74FCT16841T CY74FCT162841T Function Table[1] Pin Description Name Description Inputs Outputs D Data Inputs D LE OE Q LE Latch Enable Input (Active HIGH) H H L H OE Output Enable Input (Active LOW) L H L L O Three-State Outputs X L L Q[2] X X H Z Maximum Ratings[3, 4] (Above which the useful life may be impaired. For user guidelines, not tested.) Power Dissipation .......................................................... 1.0W Storage Temperature ...................................... -55C to +125C Static Discharge Voltage ........................................... >2001V (per MIL-STD-883, Method 3015) Ambient Temperature with Power Applied .................................................. -55C to +125C Operating Range DC Input Voltage .................................................-0.5V to +7.0V Range DC Output Voltage ..............................................-0.5V to +7.0V Industrial DC Output Current (Maximum Sink Current/Pin) ........................... -60 to +120 mA Ambient Temperature VCC -40C to +85C 5V 10% Electrical Characteristics Over the Operating Range Parameter Description Test Conditions VIH Input HIGH Voltage Guaranteed Logic HIGH Level VIL Input LOW Voltage Guaranteed Logic LOW Level Min. Input Hysteresis VIK Input Clamp Diode Voltage VCC=Min., IIN=-18 mA IIH Input HIGH Current IIL Input LOW Current IOZH Max. 2.0 Unit V 0.8 [6] VH Typ.[5] 100 mV -1.2 V VCC=Max., VI=VCC 1 A VCC=Max., VI=GND 1 A High Impedance Output Current (Three-State Output pins) VCC=Max., VOUT=2.7V 1 A IOZL High Impedance Output Current (Three-State Output pins) VCC=Max., VOUT=0.5V 1 A IOS Short Circuit Current[7] VCC=Max., VOUT=GND -80 -200 mA IO Output Drive Current[7] VCC=Max., VOUT=2.5V -50 -180 mA Power-Off Disable VCC=0V, VOUT4.5V 1 A IOFF [8] -0.7 V -140 Notes: 1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don't Care. Z = HIGH Impedance. 2. Output level before LE HIGH-to-LOW Transition. 3. Operation beyond the limits set forth may impair the useful life of the device. Unless otherwise noted, these limits are over the operating free-air temperature range. 4. Unused inputs must always be connected to an appropriate logic voltage level, preferably either VCC or ground. 5. Typical values are at VCC= 5.0V, TA= +25C ambient. 6. This parameter is guaranteed but not tested. 7. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter tests, I OS tests should be performed last. 8. Tested at +25C. 2 CY74FCT16841T CY74FCT162841T Output Drive Characteristics for CY74FCT16841T Parameter VOH VOL Min. Typ.[5] VCC=Min., IOH=-3 mA 2.5 3.5 VCC=Min., IOH=-15 mA 2.4 3.5 VCC=Min., IOH=-32 mA 2.0 3.0 Description Output HIGH Voltage Output LOW Voltage Test Conditions VCC=Min., IOL=64 mA Max. Unit V 0.2 0.55 V Min. Typ.[5] Max. Unit Output Drive Characteristics for CY74FCT162841T Parameter IODL Description Test Conditions [7] VCC=5V, VIN=VIH or VIL, VOUT=1.5V 60 115 150 mA [7] -150 mA Output LOW Current IODH Output HIGH Current VCC=5V, VIN=VIH or VIL, VOUT=1.5V -60 -115 VOH Output HIGH Voltage VCC=Min., IOH=-24 mA 2.4 3.3 VOL Output LOW Voltage VCC=Min., IOL=24 mA V 0.3 0.55 V Typ.[5] Max. Unit Capacitance[6] (TA =+25C, f = 1.0 MHz) Symbol Description Conditions CIN Input Capacitance VIN = 0V 4.5 6.0 pF COUT Output Capacitance VOUT = 0V 5.5 8.0 pF Min. Typ.[5] Power Supply Characteristics Parameter Description Test Conditions Max. Unit ICC Quiescent Power Supply Current VCC=Max. VIN<0.2V VIN>VCC-0.2V -- 5 500 A ICC Quiescent Power Supply Current (TTL inputs HIGH) VCC=Max., VIN=3.4V[9] -- 0.5 1.5 mA ICCD Dynamic Power Supply Current[10] VCC=Max., One Input Toggling, 50% Duty Cycle, Outputs Open, OE=GND VIN=VCC or VIN=GND -- 60 100 A/MHz IC Total Power Supply Current[11] VCC=Max., f1=10 MHz, 50% Duty Cycle, Outputs Open, One Bit Toggling, OE=GND LE = VCC VIN=VCC or VIN=GND -- 0.6 1.5 mA VIN=3.4V or VIN=GND -- 0.9 2.3 VIN=VCC or VIN=GND -- 3.0 5.5[12] VIN=3.4V or VIN=GND -- 8.0 20.5[12] VCC=Max., f1=2.5 MHz, 50% Duty Cycle, Outputs Open, Twenty Bits Toggling, OE=GND LE = VCC Notes: 9. Per TTL driven input (VIN=3.4V); all other inputs at VCC or GND. 10. This parameter is not directly testable, but is derived for use in Total Power Supply calculations. = IQUIESCENT + IINPUTS + IDYNAMIC 11. IC IC = I CC+ICCDHN T+ICCD(f0/2 + f 1N1) ICC = Quiescent Current with CMOS input levels ICC = Power Supply Current for a TTL HIGH input (VIN=3.4V) DH = Duty Cycle for TTL inputs HIGH NT = Number of TTL inputs at DH ICCD = Dynamic Current caused by an input transition pair (HLH or LHL) f0 = Clock frequency for registered devices, otherwise zero f1 = Input signal frequency N1 = Number of inputs changing at f1 All currents are in milliamps and all frequencies are in megahertz. 12. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested. 3 CY74FCT16841T CY74FCT162841T Switching Characteristics Over the Operating Range[13] 74FCT16841AT 74FCT16841BT 74FCT16841CT 74FCT162841AT 74FCT162841BT 74FCT162841CT Parameter tPLH tPHL tPLH tPHL tPHZ tPZL tPHZ tPLZ Description Propagation Delay D to Q (LE=HIGH) Propagation Delay LE to Q Output Enable Time OE to Q Output Disable Time OE to Q tSU Set-Up Time HIGH or LOW, D to LE tH Hold Time HIGH or LOW, D to LE tW LE Pulse Width HIGH tSK(O) Output Skew [18] Condition[14] Min. Max. Min. Max. Min. Max. Unit Fig. No.[15] CL=50 pF RL=500 1.5 9.0 1.5 6.5 1.5 5.5 ns 1, 5 CL=300 pF[16] RL=500 1.5 13.0 1.5 13.0 1.5 13.0 CL=50 pF RL=500 1.5 12.0 1.5 8.0 1.5 6.4 ns 1, 5 CL=300 pF[16] RL=500 1.5 16.0 1.5 15.5 1.5 15.0 CL=50 pF RL=500 1.5 11.5 1.5 8.0 1.5 6.5 ns 1, 7, 8 CL=300 pF[16] RL=500 1.5 23.0 1.5 14.0 1.5 12.0 CL=5 pF[16] RL=500 1.5 7.0 1.5 6.0 1.5 5.7 ns 1, 7, 8 CL=50 pF RL=500 1.5 8.0 1.5 7.0 1.5 6.0 CL=50 pF RL=500 2.5 -- 2.5 -- 2.0 -- ns 9 2.5 -- 2.5 -- 1.5 -- ns 9 4.0[17] -- 4.0[17] -- 4.0[17] -- ns 5 -- 0.5 -- 0.5 -- 0.5 ns -- Notes: 13. Minimum limits are guaranteed but not tested on Propagation Delays. 14. See test circuit and waveform. 15. See "Parameter Measurement Information" in the General Information section. 16. These conditions are guaranteed but not tested. 17. These limits are guaranteed but not tested. 18. Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design. 4 CY74FCT16841T CY74FCT162841T Ordering Information for CY74FCT16841T Speed (ns) 5.5 6.5 9.0 Ordering Code Package Name Package Type CY74FCT16841CTPAC Z56 56-Lead (240-Mil) TSSOP CY74FCT16841CTPVC O56 56-Lead (300-Mil) SSOP CY74FCT16841ATPAC Z56 56-Lead (240-Mil) TSSOP CY74FCT16841ATPVC O56 56-Lead (300-Mil) SSOP CY74FCT16841TPAC Z56 56-Lead (240-Mil) TSSOP CY74FCT16841TPVC O56 56-Lead (300-Mil) SSOP Operating Range Industrial Industrial Industrial Ordering Information CY74FCT162841T Speed (ns) 5.5 6.5 9.0 Ordering Code Package Name Package Type CY74FCT162841CTPAC Z56 56-Lead (240-Mil) TSSOP CY74FCT162841CTPVC O56 56-Lead (300-Mil) SSOP CY74FCT162841ATPAC Z56 56-Lead (240-Mil) TSSOP CY74FCT162841ATPVC O56 56-Lead (300-Mil) SSOP CY74FCT162841TPAC Z56 56-Lead (240-Mil) TSSOP CY74FCT162841TPVC O56 56-Lead (300-Mil) SSOP Document #: 38-00387-B 5 Operating Range Industrial Industrial Industrial CY74FCT16841T CY74FCT162841T Package Diagrams 56-Lead Shrunk Small Outline PackageO56 56-Lead Thin Shrunk Small Outline Package Z56 (c) Cypress Semiconductor Corporation, 1997. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.