HIT HD74HC91 Datasheet

HD74HC91
8-bit Shift Register
Description
This serial-in, serial-out, 8-bit shift register is composed of eight R-S master-slave flip-flops, input gating, and a clock drive. Single-rail data and input control are gated through inputs A and B and an internal inverter to form the complementary inputs to the first bit of the shift register. Drive for the internal common clock line is provided by an inverting clock driver. This clock pulse inverter/driver causes these circuits to shift information one bit on the positive edge of an input clock pulse.
High Speed Operation: tpd (Data Word Input to Output) = 21 ns typ (CL = 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs Outputs t
n
AB Q
HH H L LX L H XL L H
X : Irrelevant t
: Reference bit time, clock low
n
t
: Bit time after 8 low-to-high clock transitions
n + 8
t
n + 8
H
Q
H
HD74HC91
Pin Arrangement
NC
NC
NC
NC
Vcc
NC
NC
1
H
Q
2
3
4
5
6
7
(Top View)
QH
A
B
CK
14
13
12
11
10
H
Q
QH
A
Inputs
B
GND
Clock
9
NC
8
2
HD74HC91
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol V
Input voltage V
IH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 1.5 — 1.5 V
4.5 3.15 — 3.15
6.0 4.2 — 4.2
V
IL
2.0 0.5 — 0.5 V
4.5 1.35 — 1.35
6.0 1.8 — 1.8
Output voltage V
OH
2.0 1.9 2.0 — 1.9 V Vin = VIH or VILIOH = –20 µA
4.5 4.4 4.5 — 4.4
6.0 5.9 6.0 — 5.9
4.5 4.18 — 4.13 IOH = –4 mA
6.0 5.68 — 5.63 IOH = –5.2 mA
V
OL
2.0 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
4.5 0.0 0.1 — 0.1
6.0 0.0 0.1 — 0.1
4.5 0.26 — 0.33 IOL = 4 mA
6.0 0.26 — 0.33 IOL = 5.2 mA Input current Iin 6.0 ±0.1 — ±1.0 µA Vin = VCC or GND Quiescent supply
I
CC
6.0 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA current
+85°C
3
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