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參數資料
| 型號： | SN54LS256 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Octal Buffer/Line Driver, 3 State; Package: 20 LEAD PDIP; No of Pins: 20; Container: Rail; Qty per Container: 18 |
| 中文描述： | 雙4位可尋址鎖存 |
| 文件頁數： | 1/6頁 |
| 文件大?。?/td> | 225K |
| 代理商： | SN54LS256 |
5-421
FAST AND LS TTL DATA
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)
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
PIN NAMES
LOADING
(Note a)
HIGH
LOW
A0, A1
Da, Db
E
CL
Q0a–Q3a,
Q0b–Q3b
NOTES:
a) 1 TTL Unit Load (U.L.) = 40
μ
A 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.
Address Inputs
Data Inputs
Enable Input (Active LOW)
Clear Input (Active LOW)
0.5 U.L.
0.5 U.L.
1.0 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0.5 U.L.
0.25 U.L.
Parallel Latch Outputs (Note b)
10 U.L.
5 (2.5) U.L.
SN54/74LS256
DUAL 4-BIT
ADDRESSABLE LATCH
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
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相關代理商/技術參數 |
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| SN54LS259BW | 制造商:Texas Instruments 功能描述: |
| SN54LS266J | 制造商:Texas Instruments 功能描述:XNOR Gate 4-Element 2-IN Bipolar 14-Pin CDIP Tube 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:XNOR GATE 4-ELEM 2-IN BIPOLAR 14CDIP - Rail/Tube |
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