TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
1
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHCT240AF,TC74VHCT240AFW,TC74VHCT240AFT,TC74VHCT240AFK
TC74VHCT244AF,TC74VHCT244AFW,TC74VHCT244 AFT,TC74VHCT244AFK
Octal Bus Buffer
TC74VHCT240AF/AFW/AFT/AFK
Inverted, 3-State Outputs
TC74VHCT244AF/AFW/AFT/AFK
Non-Inverted, 3-State Outputs
The TC74VHCT240A and 244A are advanced high speed
CMOS OCTAL BUS BUFFFERs fabricated with silicon gate
C2MOS technology. They achieve the high speed operation
similar to equivalent Bipolar Schottky TTL while maintaining
the CMOS low power dissipation.
The TC74VHCT240A is an inverting 3-state buffer having two
active-low output enables. The TC74VHCT244A is a
non-inverting 3-state buffer, and has two active-low output
enables.
These devices are designed to be used with 3-state memory
address drivers, etc.
The input voltage are compatible with TTL output voltage.
These devices may be used as a level converter for interfacing
3.3 V to 5 V system.
Input protection and output circuit ensure that 0 to 5.5 V can
be applied to the input and output (Note) pins without regard to
the supply voltage. These structure prevents device destruction
due to mismatched supply and input/output voltages such as
battery back up, hot board insertion, etc.
Note: Output in off-st ate
Features
• High speed: tpd = 6.1 ns (typ.) at VCC = 5 V
• Low power dissipation: ICC = 4 µA (max) at Ta = 25°C
• Compatible with TTL outputs: VIL = 0.8 V (max)
V
IH = 2.0 V (min)
• Power down protection is provided on all inputs and outputs
• Balanced propagation delays: tpLH ∼
−tpHL
• Low noise: VOLP = 1.0 V (max)
• Pin and function compatible with the 74 series
(74AC/HC/F/ALS/LS etc.) 240/244 type.
Weight
SOP20- P-300-1.2 7A : 0.22 g (typ.)
SOP20- P-300-1.2 7 : 0.22 g (typ.)
SOL20-P-300- 1. 27 : 0.46 g (typ.)
TSSOP20-P- 0044-0.65A : 0.08 g (typ.)
VSSOP20-P-0030-0.50 : 0.03 g (typ.)
Note: xxxFW ( J EDE C SOP) is not available in
Japan.
TC74VHCT240AF, TC74VHCT244AF
TC74VHCT240AFW, TC74VHCT244AFW
TC74VHCT240AFT, TC74VHCT244AFT
TC74VHCT240AFK, TC74VHCT244AFK
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
2
Pin Assignment
IEC Logic Symbol
Trut h Table
Inputs Outputs
G An Yn n
Y
L L L H
L H H L
H X Z Z
X: Don’t care
Z: High impedanc e
Yn : TC74V HCT244A
n
Y : TC74VHCT240A
VCC
16
2A4
2Y1
2A315
14
13
12
11
20
1
2
3
4
5
6
7
1A3
2Y2
1A4
1Y2
1A1
3Y1
8
1Y1
19
2A2
G2
1A2
3Y2
18
9
4Y2
GND 10 2A1
17
4Y1
(top view)
TC74VHCT240A
G1 VCC
16
2A4
15
14
13
12
11
20
1
2
3
4
5
6
7
2Y2
1A4
1Y3
8
1Y1
19
2A2
G2
1A2
18
9
2Y4
GND 10 2A1
17
1Y4
(top view)
TC74VHCT244A
1Y2
2A3
2Y1
1A3
2Y3
1A1
G1
(1)
(2)
(6)
(4)
1A2
1A4
1A3 (8)
(18)
(14) 2Y1
4Y1
(16)
(12) 3Y1
EN
G1
1Y11A1
TC74VHCT240A
(19)
(11)
(15)
(13)
2A2
2A4
2A3 (17)
(9)
(5) 2Y2
4Y2
(7)
(3) 3Y2
EN
G2
1Y22A1
(1)
(2)
(6)
(4)
1A2
1A4
1A3 (8)
(18)
(14) 1Y2
1Y4
(16)
(12) 1Y3
EN
G1
1Y1
1A1
TC74VHCT244A
(19)
(11)
(15)
(13)
2A2
2A4
2A3 (17)
(9)
(5) 2Y2
2Y4
(7)
(3) 2Y3
EN
G2
2Y1
2A1
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
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Absolute Maximum Ratings ( Note 1)
Characteristics Symbol Rating Unit
Supply voltage range VCC −0.5 to 7.0 V
DC input voltage VIN −0.5 to 7.0 V
−0.5 to 7.0 (Note 2)
DC output voltage VOUT −0.5 to V CC + 0.5 (Note 3) V
Input diode current IIK −20 mA
Output diode current IOK ±20 (Note 4) mA
DC output current IOUT ±25 mA
DC VCC/ground current ICC ±75 mA
Power dissipation PD 180 mW
Storage temperature Tstg −65 to 150 °C
Note 1: Exceeding any of the absolut e m aximum ratings, even brief l y, lead to deter i or ation in IC perf or m ance or
even destr ucti on.
Note 2: Output in off-state
Note 3: High or low state. IOUT absolute maximum r ating m ust be observed.
Note 4: VOUT < GND, VOUT > VCC
Recomm end ed Operating Co ndi tions (No t e 1)
Characteristics Symbol Rating Unit
Supply voltage VCC 4.5 to 5.5 V
Input voltage VIN 0 to 5.5 V
0 to 5.5 (Note 2)
Output vol tage VOUT 0 to VCC (Note 3) V
Operating te mperature Topr −40 to 85 ° C
Input rise and fall time dt/dV 0 to 20 ns/V
Note 1: The recommended oper ating condit i ons ar e r equired to ensur e th e nor m al operation of the devic e.
Unused inputs must be tied to either VCC or GND.
Note 2: Output in off-state
Note 3: High or low state
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
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Electrical Characteristics
DC Characteristics
Test Condition Ta = 25°C Ta =
−40 to 85°C
Characteristics Symbol
VCC (V) Min Typ. Max Min Max Unit
High-level input
voltage VIH ⎯ 4.5 to
5.5 2.0 ⎯ ⎯ 2.0 ⎯ V
Low-level input
voltage VIL ⎯ 4.5 to
5.5 ⎯ ⎯ 0.8 ⎯ 0.8 V
IOH = −50 µA 4.5 4.40 4.50 ⎯ 4.40 ⎯
High-level output
voltage VOH VIN
= VIH or
VIL IOH = −8 mA 4.5 3.94 ⎯ ⎯ 3.80 ⎯ V
IOL = 50 µA 4.5 ⎯ 0.0 0.10 ⎯ 0.10
Low-lev el output
voltage VOL VIN
= VIH or
VIL IOL = 8 mA 4.5 ⎯ ⎯ 0.36 ⎯ 0.44 V
3-state output
off-state current IOZ VIN = VIH or VIL
VOUT = VCC or GND 5.5 ⎯ ⎯ ±0.25 ⎯ ±2.50 µA
Input leakage
current IIN VIN = 5.5 V or GND 0 to 5.5 ⎯ ⎯ ±0.1 ⎯ ±1.0 µA
ICC V
IN = VCC or GND 5.5 ⎯ ⎯ 4.0 ⎯ 40.0 µA
Quiescent supply
current ICCT Per in put: VIN = 3.4 V
Other input: VCC o r GND 5.5 ⎯ ⎯ 1.35 ⎯ 1.50 mA
Output leakage
current IOPD VOUT = 5.5 V 0 ⎯ ⎯ 0.5 ⎯ 5.0 µA
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
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AC Characteristics (input: tr = tf = 3 ns)
Test Condition Ta = 25°C Ta =
−40 to 85°C
Characteristics Symbol
VCC (V) CL (pF) Min Typ. Max Min Max Unit
15 ⎯ 5.6 7.8 1.0 9.0
Propagation delay
time
(TC74VHCT240A)
tpLH
tpHL ⎯ 5.0 ± 0.5 50 ⎯ 6.1 8.8 1.0 10.0
ns
15 ⎯ 5.4 7.4 1.0 8.5
Propagation delay
time
(TC74VHCT244A)
tpLH
tpHL ⎯ 5.0 ± 0.5 50 ⎯ 5.9 8.4 1.0 9.5 ns
15 ⎯ 7.7 10.4 1.0 12.0
3-state output enable
time tpZL
tpZH RL = 1 kΩ 5.0 ± 0.5 50 ⎯ 8.2 11.4 1.0 13.0 ns
3-state output disable
time tpLZ
tpHZ RL = 1 kΩ 5.0 ± 0.5 50 ⎯ 8.8 11.4 1.0 13.0 ns
Output to output skew tosLH
tosHL (Note 1) 5.0 ± 0.5 50 ⎯ ⎯ 1.0 ⎯ 1.0 ns
Input capac it ance CIN ⎯ ⎯ 4 10 ⎯ 10 pF
Output capacitance COUT ⎯ ⎯ 9 ⎯ ⎯ ⎯ pF
TC74VHCT240A ⎯ 19 ⎯ ⎯ ⎯
Power dissipation
capacitance (Note 2) CPD TC74VHCT244A ⎯ 18 ⎯ ⎯ ⎯ pF
Note 1: Parameter guaranteed by desi gn.
tosLH = |tpLHm − tpLHn|, tosHL = |tpHLm − tpHLn|
Note 2: CPD is defined as the value of the internal equival ent ca pacitance which is calculated from the operating
current consum ption without load.
Average operating current can be obtained by the equatio n:
ICC (opr) = CPD·VCC·fIN + ICC/8 (per bit)
Noise Characteristics (input: tr = tf = 3 ns) (Note)
Test Condition Ta = 25°C
Characteristics Symbol VCC (V) Typ. Limit Unit
Quiet output maxi mum dynamic VOL V
OLP CL = 50 pF 5.0 0.8
(0.9)
1.0
(1.1) V
Quiet outpu t minimum dynamic VOL V
OLV CL = 50 pF 5.0 −0.8
(−0.9)
−1.0
(−1.1) V
Mi n imum high level d y na mic i n put
voltage VIHD CL = 50 pF 5.0 ⎯ 2.0 V
Maximum low level dynamic input
voltage VILD CL = 50 pF 5.0 ⎯ 0.8 V
Note: The value in ( ) only applies to JEDEC SOP (FW) devices.
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
6
Package Dimensions
Weig ht: 0.22 g (ty p.)
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
7
Package Dimensions
Weig ht: 0.22 g (ty p.)
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
8
Package Dimensions (Note)
Note: This package is not available in Japan.
Weig ht: 0.46 g (ty p.)
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
9
Package Dimensions
Weig ht: 0.08 g (ty p.)
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
10
Package Dimensions
Weigh t : 0. 03 g (ty p.)
TC74VHCT240,244AF/AFW/AFT/AFK
2006-02-01
11
Note: Lead (Pb)-Free Packages
SOP20-P-300-1.27A TSSOP20-P-0044-0.65A VSSOP20-P-0030-0.50
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