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PDF HD74BC245A Data sheet ( Hoja de datos )
| Número de pieza | HD74BC245A | |
| Descripción | Octal Bus Transceivers With 3 State Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74BC245A
Octal Bus Transceivers With 3 State Outputs
ADE-205-008A (Z)
Rev. 1
March 1993
Description
The HD74BC245A 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 ten buffers 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 low, data flows from
the B inputs to the A outputs. When 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.
• Built in input pull up circuit can make input pins be open, when not used.
• TTL level input
• Wide operating temperature range
Ta = –40 to + 85°C
Function Table
Control Inputs
G
L
L
H
H : High level
L : Low level
Z : High impedance
DiR
L
H
X
Operation
B data to A bus
A data to B bus
Z
1 page  
Switching Test Method (CL = 50 pF)
Item
Propagation delay time
Output enable time
Output disable time
Input capacitanse
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)
HD74BC245A
Ta = –40 to 85°C
VCC = 5.0 V ±10%
Min Max
3.0 7.0
3.0 7.0
3.0 7.0
3.0 7.0
3.0 11.0
3.0 11.0
3.0 11.0
3.0 11.0
3.0 10.0
3.0 10.0
3.0 10.0
3.0 10.0
—
—
Unit Test Conditions
ns An to Bn
ns Bn to An
ns G to Bn
ns G to An
ns G to Bn
ns G to An
pF VIN = VCC or GND
pF VI/O = VCC or GND
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 Ω
VCC
G
S1
A1
Output
500 Ω
B1
CL= 450 Ω
DiR 50 pF 50 Ω Scope
*4
OPEN
7V
Notes:
1. CL includes probe and jig capacitance.
2. A2-B2, A3-B3, A4-B4, A5-B5, A6-B6, A7-B7, A8-B8 are identical to above load circuit.
3. S1: Input-Output change switch.
4. Open: tPLH, tPHL, tZH, tHZ
7 V: tZL, tLZ
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HD74BC245A.PDF ] | |
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