HD74HC95 PDF даташит
Спецификация HD74HC95 изготовлена «Hitachi Semiconductor» и имеет функцию, называемую «4-bit Parallel Access Shift Register». |
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Детали детали
Номер произв | HD74HC95 |
Описание | 4-bit Parallel Access Shift Register |
Производители | Hitachi Semiconductor |
логотип |
8 Pages
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HD74HC95
4-bit Parallel Access Shift Register
Description
This 4-bit register features parallel and serial inputs, parallel outputs, mode control, and two clock inputs.
The register has three mode operation:
• Parallel (broadside) load
• Shift right (the direction QA toward QD)
• Shift left (the direction QD toward QA)
Parallel loading is accomplished by applying the four bits of data and taking the mode conrol input high.
The data is loaded into the associated flip-flops and appears at the outputs after the high-to-low transition of
the clock-2 input. During loading, the entry of serial data is inhibited. Shift right is accomplished on the
high-to-low transition of clock-1 when the mode control is low; shift left is accomplished on the high-to-
low transition of clock-2 when the mode control is high by connecting the output of each flip-flop (QD to
input C, etc.) and serial data is entered at input D. The clock input may be applied commonly to clock-1
and clock-2 if both modes can be clocked from the same source. Changes at the mode control input should
normally be made while both clock inputs are low: however, conditions described in the last three lines of
the function table will also ensure that register contents are protected.
Features
• High Speed Operation: tpd (Clock to Q) = 17 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)
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HD74HC95
Function Table
Inputs
Clocks
Parallel
Mode Control 2 (L) 1 (R) Serial A B C D
H HX X XX X X
H XXab c d
H
X
X
QB+
QC+
QD+
d
L L HX XX X X
L X HXX X X
L X L XX X X
L L X XX X X
L L X XX X X
L HX XX X X
HL
XX X X X
HH X XX X X
Outputs
QA QB
QA0
QB0
ab
QBn
QA0
H
L
QA0
QA0
QA0
QA0
QA0
QCn
QB0
QAn
QAn
QB0
QB0
QB0
QB0
QB0
QC
QC0
c
QDn
QC0
QBn
QBn
QC0
QC0
QC0
QC0
QC0
QD
QD0
d
d
QD0
QCn
QCn
QD0
QD0
QD0
QD0
QD0
Pin Arrangement
Serial
Input
1
A2
B3
Inputs
C4
D5
Mode
Control
6
GND 7
Serial
A Input QA
B QB
C QC
D QD
Mode CK1
CK2
(Top View)
14 VCC
13 QA
12 QB
Outputs
11 QC
10 QD
9
Clock1
R-Shift
8
Clock2
L-Shift
(Load)
2
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HD74HC95
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
3
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