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PDF HD74BC244A Data sheet ( Hoja de datos )
| Número de pieza | HD74BC244A | |
| Descripción | Octal Buffers/Line Drivers With 3 State Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74BC244A
Octal Buffers/Line Drivers With 3 State Outputs
ADE-205-007A (Z)
2nd. Edition
March 1993
Description
The HD74BC244A 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 inverter drivers with
three state outputs in a 20 pin package. This device is a non inverting buffer and has two active low
enables (1G and 2G). Each enable independently controls 4 buffers.
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
Inputs
G
H
L
L
H : High level
L : Low level
X : Immaterial
Z : High impedance
A
X
H
L
Output Y
Z
H
L
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
tZH 3.0 8.0
tZL 3.0 8.0
tHZ 3.0 7.0
tLZ 3.0 7.0
CIN 3.0(Typ)
CO 15.0(Typ)
HD74BC244A
Ta = –40 to 85°C
VCC = 5.0 V ±10%
Min Max
3.0 7.0
3.0 7.0
3.0 10.0
3.0 10.0
3.0 9.0
3.0 9.0
—
—
Unit Test Conditions
ns See under figure
ns
ns
pF VIN = VCC or GND
pF VO = VCC or GND
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 Ω
VCC
Output
G
1Y1
1A1
1A2
500 Ω
CL =
50 pF
450 Ω
50 Ω Scope
Output
1A3
1Y2
Same as above
load circuit
1A4
1Y3
Same as above
load circuit
1Y4
Same as above
load circuit
Notes:
1. CL includes probe and jig capacitance.
2. 2G, 2A1-2A4 to 2Y1-2Y4 are identical to above load circuit.
2. Open: tPLH, tPHL, tZH, tHZ
7 V: tZL, tLZ
*3
OPEN
7V
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HD74BC244A.PDF ] | |
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