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HD74HC91

Hitachi Semiconductor
Part Number HD74HC91
Manufacturer Hitachi Semiconductor
Description 8-bit Shift Register
Published Mar 23, 2005
Detailed Description HD74HC91 8-bit Shift Register Description This serial-in, serial-out, 8-bit shift register is composed of eight R-S mas...
Datasheet PDF File HD74HC91 PDF File

HD74HC91
HD74HC91

Overview
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.
Features • • • • • 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 tn A H L X X : tn : t n + 8: B H X L Irrelevant Reference bit time, clock low Bit time after 8 low-to-high clock transitions Outputs tn + 8 QH H L L QH L H H HD74HC91 Pin Arrangement NC NC NC NC Vcc NC NC 1 2 3 4 5 6 7 (Top View) CK QH QH A B 14 13 12 11 10 9 8 QH QH A Inputs B GND Clock NC 2 HD74HC91 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.
5 1.
35 1.
8 — — — — — 0.
1 0.
1 0.
1 0.
33 0.
33 ±1.
0 40 µA µA I OL = 4 mA I OL = 5.
2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.
2 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V Unit V Test Conditions VCC (V) Min Typ Max Min 2.
0 4.
5 6.
0 1.
5 — 3.
15 — 4.
2 — — — — — — — — — — 0.
5 1.
5 3.
15 4.
2 — VIL 2.
0 4.
5 6.
0 1.
35 — 1.
8 — 1.
9 4.
4 5.
9 4.
13 5.
63 — — — Output voltage VOH 2.
0 4.
5 6.
0 4.
5 6.
0 1.
9 2.
0 — 4.
4 4.
5 — 5.
9 6.
0 — 4.
18 — 5.
68 — — — — — — — — — — VOL 2.
0 4.
5 6.
0 4.
5 6.
0 0.
0 0.
1 0.
0 0.
1 0.
0 0.
1 — — — — 0.
26 — 0.
26 — ±0.
1 — 4.
0 — Input current Quiescent supply current Iin I CC 6.
0 6.
0 3 HD74HC91 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = 25°C Item Maximum cloc...


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