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PDF HD74HCT640 Data sheet ( Hoja de datos )
| Número de pieza | HD74HCT640 | |
| Descripción | Octal Bus Transceivers (with 3-state outputs) | |
| Fabricantes | Hitachi Semiconductor | |
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HD74HCT640/HD74HCT643
Octal Bus Transceivers (with 3-state outputs)
Description
Both the HD74HCT640 and the HD74HCT643 have one active low enable input (G), and a direction
control (DIR). When the DIR input is high, data flows from the A inputs to the B outputs. When DIR is
low, data flows from B to A.
The HD74HCT640 transfers inverted data from one bus to the other. The HD74HCT643 transfers inverted
data from the A bus to the B bus and non-inverted data from the B bus to the A bus.
Features
• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
• High Speed Operation: tpd (A to B) = 14.5 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 4.5 to 5.5 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Control Input
G
L
L
H
DIR
L
H
X
Operation
HD74HCT640
B data to A bus
A data to B bus
Isolation
HD74HCT643
B data to A bus
A data to B bus
Isolation
1 page  
HD74HCT640/HD74HCT643
DC Characteristics
Ta = 25°C
Ta = –40 to
+85°C
Test Conditions
Item
Input voltage
Symbol Min Typ Max Min
VIH 2.0 — — 2.0
Max
—
Unit
V
VCC (V)
4.5 to
5.5
VIL — — 0.8 — 0.8 V 4.5 to
5.5
Output voltage
VOH
VOL
Off-state output
current
I OZ
Input current
Iin
Quiescent current ICC
4.4 — — 4.4 — V
4.18 — — 4.13 —
— — 0.1 — 0.1 V
— — 0.26 — 0.33
— — ±0.5 — ±5.0 µA
4.5
4.5
4.5
4.5
5.5
— — ±0.1 —
— — 4.0 —
±1.0 µA
40 µA
5.5
5.5
Vin = VIH or VIL IOH = –20 µA
IOH = –6 mA
Vin = VIH or VIL IOL = 20 µA
IOL = 6 mA
Vin = VIH or VIL,
Vout = VCC or GND
Vin = VCC or GND
Vin = VCC or GND, Iout = 0 µA
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Item
Symbol
Propagation delay tPLH
time
t PHL
Output enable
t ZH
time
t ZL
Output disable
t HZ
time
t LZ
Output rise/fall
time
t TLH
t THL
Input capacitance Cin
Ta = 25°C
Ta = –40 to
+85°C
Min Typ Max Min Max
— 13 18 — 23
— 16 18 — 23
— 16 46 — 58
— 16 46 — 58
— 17 43 — 54
— 21 43 — 54
— 4 12 — 15
— 5 10 — 10
Unit
ns
ns
ns
ns
pF
Test Conditions
VCC (V)
4.5
4.5
4.5
4.5
4.5
4.5
4.5
—
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HD74HCT640.PDF ] | |
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