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PDF HD74BC373A Data sheet ( Hoja de datos )
| Número de pieza | HD74BC373A | |
| Descripción | Octal D Type Transparent Latches With 3 State Outputs | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74BC373A
Octal D Type Transparent Latches With 3 State Outputs
ADE-205-009A(Z)
Rev. 1
March 1993
Description
The HD74BC373A 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 D type latches with
three state outputs in a 20 pin package. When the latch enable input is high, the Q outputs will follow the
D inputs. When the latch enable goes low, data at the D inputs will be retained at the outputs until latch
enable returns high again. When a high logic level is applied to the output control input, all outputs go to a
high impedance state, regardless of what signals are present at the other inputs and the state of the storage
elements.
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 input pins
Ta = –40 to + 85°C
Function Table
Inputs
G LE
HX
LH
LH
LL
H : High level
L : Low level
X : Immaterial
Z : High impedance
D
X
L
H
X
Output Q
Z
L
H
No change
1 page  
Switching Test Method (CL = 50 pF)
Item
Symbol
Ta = 25°C
VCC = 5.0 V
Min Max
Propagation
delay time
D→Q
LE → Q
Output enable time
Output disable time
Setup time
Hold time
Pulse width
Input capacitanse
Output capacitance
t PLH
t PHL
t PLH
t PHL
t ZH
t ZL
t HZ
t LZ
tS(H)
tS(L)
th(H)
th(L)
tw
CIN
CO
3.0 8.0
3.0 8.0
3.0 8.0
3.0 8.0
3.0 9.0
3.0 9.0
3.0 8.0
3.0 8.0
2.0 —
2.0 —
2.0 —
2.0 —
6.0 —
3.0(Typ)
15.0(Typ)
HD74BC373A
Ta = –40 to 85°C
VCC = 5.0 V ±10%
Min Max
3.0 10.0
3.0 10.0
3.0 10.0
3.0 10.0
3.0 11.0
3.0 11.0
3.0 10.0
3.0 10.0
2.0 —
2.0 —
2.0 —
2.0 —
6.0 —
—
—
Unit Test Conditions
ns See under figure
ns
ns
ns
ns
ns
ns
pF VIN = VCC or GND
pF VO = VCC or GND
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 Ω
Input
Pulse Generator
Zout = 50 Ω
VCC
G
Output
1D to 8D
1Q to 8Q
CL =
LE 50 pF
500 Ω
450 Ω
50 Ω Scope
Notes:
1. CL includes probe and jig capacitance.
2. Open: tPLH, tPHL, tZH, tHZ, th, tSU, tw
7 V: tZL, tLZ
*2
OPEN
7V
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HD74BC373A.PDF ] | |
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