- 您现在的位置：买卖IC网 > PDF目录29134 > MM54C923J-MIL (NATIONAL SEMICONDUCTOR CORP) CMOS SERIES, 9-BIT ENCODER, TRUE OUTPUT, CDIP20 PDF资料下载
参数资料
| 型号： | MM54C923J-MIL |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 算术逻辑单元 |
| 英文描述： | CMOS SERIES, 9-BIT ENCODER, TRUE OUTPUT, CDIP20 |
| 文件页数： | 1/7页 |
| 文件大小： | 16K |
| 代理商： | MM54C923J-MIL |
Original Creation Date: 10/26/95
Last Update Date: 05/19/97
Last Major Revision Date: 04/02/97
MNMM54C923-X REV 1A0
MICROCIRCUIT DATA SHEET
20-KEY ENCODER
General Description
These CMOS key encoders provide all the necessary logic to fully encode an array of SPST
switches. The keyboard scan can be implemented by either an external clock or external
capacitor. These encoders also have on-chip pull-up devices which permit switches with up
to 50K Ohms on resistance to be used. No diodes in the switch array are needed to
eliminate ghost switches. The internal debounce circuit needs only a single external
capacitor and can be defeated by omitting the capacitor. A Data Available output goes to a
high level when a valid keyboard entry has been made. The Data Available output returns to
a low level when the entered key is released, even if another key is depressed. The Data
Available will return high to indicate acceptance of the new key after a normal debounce
period; this two-key roll-over is provided between any two switches.
An internal register remembers the last key pressed even after the key is release. The
TRI-STATE outputs provide for easy expansion and bus operation and are LPTTL compatible.
NS Part Numbers
MM54C923J-MIL
Industry Part Number
MM54C923
Prime Die
MM54C923
Processing
MIL-STD-883, Method 5004
Quality Conformance Inspection
MIL-STD-883, Method 5005
Subgrp Description
Temp ( C)
o
1
Static tests at
+25
2
Static tests at
+125
3
Static tests at
-55
4
Dynamic tests at
+25
5
Dynamic tests at
+125
6
Dynamic tests at
-55
7
Functional tests at
+25
8A
Functional tests at
+125
8B
Functional tests at
-55
9
Switching tests at
+25
10
Switching tests at
+125
11
Switching tests at
-55
1
相关PDF资料 |
PDF描述 |
|---|---|
| MM54HC05N | HC/UH SERIES, HEX 1-INPUT INVERT GATE, PDIP14 |
| MM54HC109AE | HC/UH SERIES, DUAL POSITIVE EDGE TRIGGERED J-KBAR FLIP-FLOP, COMPLEMENTARY OUTPUT, CQCC20 |
| MM54HC109AW | HC/UH SERIES, DUAL POSITIVE EDGE TRIGGERED J-KBAR FLIP-FLOP, COMPLEMENTARY OUTPUT, CDFP16 |
| MM54HC109J | HC/UH SERIES, DUAL POSITIVE EDGE TRIGGERED J-KBAR FLIP-FLOP, COMPLEMENTARY OUTPUT, CDIP16 |
| MM74HC109J | HC/UH SERIES, DUAL POSITIVE EDGE TRIGGERED J-KBAR FLIP-FLOP, COMPLEMENTARY OUTPUT, CDIP16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MM54C932 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Phase Comparator |
| MM54C932N | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Phase Comparator |
| MM54C93J | 制造商:NSC 制造商全称:National Semiconductor 功能描述:4-Bit Decade, Binary Counter |
| MM54C93N | 制造商:NSC 制造商全称:National Semiconductor 功能描述:4-Bit Decade, Binary Counter |
| MM54C941 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Octal Buffers/Line Receivers/ Line Drivers with TRI-STATE Outputs |
发布紧急采购，3分钟左右您将得到回复。