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PDF HD74BC640A Data sheet ( Hoja de datos )
| Número de pieza | HD74BC640A | |
| Descripción | Octal Bus Transceivers With 3 State Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74BC640A
Octal Bus Transceivers With 3 State Outputs
ADE-205-026 (Z)
Rev.0
June 1993
Description
The HD74BC640A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC. When the frequency is 10 MHz. The device has eight bus transceivers with
three state outputs in a 20 pin package. Each device has an active low enable input (G) and a direction
control input, DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is high,
data flows from the B inputs to the A outputs. When enable inputs (G) is high, disables both A and B ports
by placing then in a high impedance.
Features
• Input/Output are at high impedance state when power supply is off.
• Input pins can be open, when not used, owing to built in input pull up circuit.
• Input is TTL level.
• Wide operating temperature range
Ta = –40 to +85°C.
Function Table
Control Inputs
G
L
L
H
H : High level
L : Low level
X : Immaterial
DIR
L
H
X
Operation
B data to A bus
A data to B bus
Isolation
1 page  
Switching Characteristics (CL = 50 pF)
Item
Propagation delay time
Output enable time
Output disable time
Input capacitance
Output capacitance
Symbol
Ta = 25°C
VCC = 5.0 V
Min Max
tPLH 3.0 6.0
tPHL 3.0 6.0
tPLH 3.0 6.0
tPHL 3.0 6.0
tZH 3.0 9.0
tZL 3.0 9.0
tZH 3.0 9.0
tZL 3.0 9.0
tHZ 3.0 8.0
tLZ 3.0 8.0
tHZ 3.0 8.0
tLZ 3.0 8.0
CIN 3.0 (Typ)
CI/O 15.0 (Typ)
HD74BC640A
Ta = –40 to +85°C
VCC = 5.0 V ±10%
Min Max
Unit
Test Conditions
3.0 7.0 ns An to Bn
3.0 7.0
3.0 7.0 ns Bn to An
3.0 7.0
3.0 11.0 ns G to Bn
3.0 11.0
3.0 11.0 ns G to An
3.0 11.0
3.0 10.0 ns G to Bn
3.0 10.0
3.0 10.0 ns G to An
3.0 10.0
— pF VIN = VCC or GND
— pF VI/O = VCC or GND
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HD74BC640A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HD74BC640A | Octal Bus Transceivers With 3 State Outputs | Hitachi Semiconductor |
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