74F322 查看數據表（PDF） - Philips Electronics

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74F322

8-bit serial/parallel register with sign extend (3-State)

Philips Electronics 

Philips Semiconductors

8-bit serial/parallel register with sign extend (3-State)

Product specification

74F322

FEATURES

• Multiplexed parallel I/O ports

• Separate serial input and output

• Sign extend function

• 3-State outputs for bus applications

• Direct Overriding Clear

DESCRIPTION

The 74F322 is an 8-bit shift register with provision for either serial or

parallel loading and with 3-State parallel outputs plus a bi-state

serial output. Parallel data inputs and outputs are multiplexed to

minimize pin count. State changes are initiated by the rising edge of

the clock. Four synchronous modes of operation are possible: hold

(store), shift right with serial entry, shift right with sign extend, and

parallel load. An asynchronous Master Reset (MR) input overrides

clocked operation and clears the registers.

The 74F322 contains eight D-type edge triggered flip-flops and the

interstage gating required to perform right shift and the intrastage

gating necessary for hold and synchronous parallel load operations.

A Low signal on RE enables shifting or parallel loading, while a High

signal enables the hold mode. A High signal on S/P enables shift

right, while a Low signal disables the 3-State output buffers and

enables parallel loading. In the shift right mode a High signal on SE

enables serial entry from either D0 or D1, as determined by the S

input. A Low signal on SE enables shift right, but Q7 reloads its

contents, thus performing the sign extend function. A High signal on

OE disables the 3-State output buffers, regardless of the other

control inputs. In this condition the shifting and loading operations

can still be performed.

PIN CONFIGURATION

RE 1

S/P 2

D0 3

I/O0 4

I/O2 5

I/O4 6

I/O6 7

OE 8

MR 9

GND 10

20 VCC

19 S

18 SE

17 D1

16 I/O1

15 I/O3

14 I/O5

13 I/O7

12 Q7

11 CP

SF00874

TYPE

74F322

TYPICAL fMAX

125MHz

TYPICAL

SUPPLY CURRENT

(TOTAL)

60mA

ORDERING INFORMATION

DESCRIPTION

20-pin plastic DIP

ORDER CODE

COMMERCIAL RANGE

VCC = 5V ±10%, Tamb = 0°C to +70°C

N74F322N

20-pin plastic SOL

N74F322D

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

74F(U.L.)

HIGH/LOW

D0, D1

Serial data inputs

1.0/1.0

S

Serial data select input

1.0/2.0

SE

Sign Extend input

1.0/3.0

CP

Clock Pulse input (Active rising edge)

1.0/1.0

S/P

Serial (High) or Parallel (Low) mode control input

1.0/1.0

RE

Register Enable input (Active Low)

1.0/1.0

MR

Asynchronous Master Reset input (Active Low)

1.0/1.0

OE

Output Enable input (Active Low)

1.0/1.0

Q7

Bi-state serial output

50/33

Multiplexed parallel data inputs or

I/On

3-State parallel outputs

NOTE: One (1.0) FAST Unit Load (U.L.) is defined as: 20µA in the High State and 0.6mA in the Low state.

3.5/1.0

150/40

LOAD VALUE

HIGH/LOW

20µA/0.6mA

20µA/1.2mA

20µA/1.8mA

20µA/0.6mA

20µA/0.6mA

20µA/0.6mA

20µA/0.6mA

20µA/0.6mA

1.0mA/20mA

70µA/0.6mA

3.0mA/24mA

1988 Apr 22

1

853-0366 93020

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