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參數(shù)資料
| 型號(hào)： | 74HC91 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 8-bit Shift Register |
| 中文描述： | 8位的移位寄存器 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 45K |
| 代理商： | 74HC91 |
December 1990
2
Philips Semiconductors
Product specification
Nine wide Schmitt trigger buffer;
open drain outputs
74HC/HCT9115
FEATURES
Schmitt trigger action on all data inputs
Output capability: standard (open drain)
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT9115 are high-speed Si-gate CMOS
devices and are pin compatible with low power Schottky
TTL (LSTTL). They are specified in compliance with
JEDEC standard no. 7A.
The 74HC/HCT9115 are nine wide Schmitt trigger buffer
with open drain outputs and Schmitt trigger inputs.
The Schmitt trigger action in the data inputs transform
slowly changing input signals into sharply defined
jitter-free output signals.
The 74HC/HCT9115 have open-drain N-transistor
outputs, which are not clamped by a diode connected to
V
CC
. In the OFF-state, i.e. when one input is HIGH, the
output may be pulled to any voltage between GND and
V
Omax
. This allows the device to be used as a
LOW-to-HIGH or HIGH-to-LOW level shifter. For digital
operation and OR-tied output applications, these devices
must have a pull-up resistor to establish a logic HIGH level.
The “9115” is identical to the “9114” but has non-inverting
outputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
1.5 V
2.
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/ t
PLZ
C
I
C
PD
propagation delay A
n
to Y
n
input capacitance
power dissipation capacitance per buffer
C
L
= 15 pF; V
CC
= 5 V
12
3.5
5
13
3.5
5
ns
pF
pF
notes 1 and 2
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