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Número de pieza | HD74HC195 | |
Descripción | 4-bit Parallel-Access Shift Register | |
Fabricantes | Hitachi Semiconductor | |
Logotipo | ||
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No Preview Available ! HD74HC195
4-bit Parallel-Access Shift Register
Description
This shift register features parallel inputs, parallel outputs, J-K serial inputs, Shift/Load control input, and a
direct overriding clear. This shift register can operate in two modes: Parallel load; shift from QA towards
QD.
Paralle loading is accomplished by applying the four bits of data, and taking the Shift/Load control Input
low. The data is loaded into the associated flip-flops and appears at the outputs after the positive transition
of the clock input. During parallel loading, serial data flow is inhibited. Serial shifting occurs
synchronously when the Shift/Load control input is high. Serial data for this mode is entered at the J-K
inputs. These inputs allow the first stage to perform as a J-K or toggle flip-flop as shown in the function
table.
Features
• High Speed Operation: tpd (Clock to Q) = 13 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)
1 page HD74HC195
DC Characteristics
Item
Input voltage
Output voltage
Input current
Quiescent supply
current
Ta = 25°C
Ta = –40 to
+85°C
Symbol
VIH
VCC (V) Min Typ Max Min
2.0 1.5 — — 1.5
4.5 3.15 — — 3.15
Max
—
—
Unit
V
6.0 4.2 — — 4.2 —
VIL 2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
VOH 2.0 1.9 2.0 — 1.9 — V
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 —
6.0 5.68 — — 5.63 —
VOL 2.0 — 0.0 0.1 — 0.1 V
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33
6.0 — — 0.26 — 0.33
Iin 6.0 — — ±0.1 — ±1.0 µA
ICC 6.0 — — 4.0 — 40 µA
Test Conditions
Vin = VIH or VIL IOH = –20 µA
IOH = –4 mA
IOH = –5.2 mA
Vin = VIH or VIL IOL = 20 µA
IOL = 4 mA
IOL = 5.2 mA
Vin = VCC or GND
Vin = VCC or GND, Iout = 0 µA
5
5 Page |
Páginas | Total 9 Páginas | |
PDF Descargar | [ Datasheet HD74HC195.PDF ] |
Número de pieza | Descripción | Fabricantes |
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