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54LS256 PDF Data sheet ( 特性 )

部品番号 54LS256
部品説明 DUAL 4-BIT ADDRESSABLE LATCH
メーカ Motorola
ロゴ Motorola ロゴ 



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54LS256 Datasheet, 54LS256 PDF,ピン配置, 機能
DUAL 4-BIT
ADDRESSABLE LATCH
The SN54/74LS256 is a Dual 4-Bit Addressable Latch with common control
inputs; these include two Address inputs (A0, A1), an active LOW Enable input
(E) and an active LOW Clear input (CL). Each latch has a Data input (D) and
four outputs (Q0 – Q3).
When the Enable (E) is HIGH and the Clear input (CL) is LOW, all outputs
(Q0 – Q3) are LOW. Dual 4-channel demultiplexing occurs when the (CL) and
E are both LOW. When CL is HIGH and E is LOW, the selected output
(Q0 – Q3), determined by the Address inputs, follows D. When the E goes
HIGH, the contents of the latch are stored. When operating in the addressable
latch mode (E = LOW, CL = HIGH), changing more than one bit of the Address
(A0, A1) could impose a transient wrong address. Therefore, this should be
done only while in the memory mode (E = CL = HIGH).
Serial-to-Parallel Capability
Output From Each Storage Bit Available
Random (Addressable) Data Entry
Easily Expandable
Active Low Common Clear
Input Clamp Diodes Limit High Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC CL E Db Q3b Q2b Q1b Q0b
16 15 14 13 12 11 10 9
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
12
A0 A1
3 4 56 78
Da Q0a Q1a Q2a Q3a GND
PIN NAMES
LOADING (Note a)
HIGH
LOW
A0, A1
Da, Db
E
Address Inputs
Data Inputs
Enable Input (Active LOW)
0.5 U.L.
0.5 U.L.
1.0 U.L.
0.25 U.L.
0.25 U.L.
0.5 U.L.
CL Clear Input (Active LOW)
0.5 U.L.
0.25 U.L.
Q0a – Q3a,
Q0b – Q3b
Parallel Latch Outputs (Note b)
10 U.L. 5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial
(74) Temperature Ranges.
SN54/74LS256
DUAL 4-BIT
ADDRESSABLE LATCH
LOW POWER SCHOTTKY
16
1
16
1
16
1
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
LOGIC SYMBOL
3
2 1 15
14 13
Da E
A0
A1
CL
Q0a Q1a Q2a Q3a
A0 E Db
A1
CL
Q0b Q1b Q2b Q3b
4 56 7
9 10 11 12
VCC = PIN 16
GND = PIN 8
FAST AND LS TTL DATA
5-1

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