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参数资料
| 型号： | MM74C928J |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 计数器 |
| 英文描述： | CMOS SERIES, ASYN NEGATIVE EDGE TRIGGERED 16-BIT UP DISPLAY DRIVER COUNTER, CDIP18 |
| 封装： | CERAMIC, DIP-18 |
| 文件页数： | 1/8页 |
| 文件大小： | 209K |
| 代理商： | MM74C928J |
TLF5919
MM74C925
MM74C926
MM74C927
MM74C928
4-Digit
Counters
with
Multiplexed
7-Segment
Output
Drivers
March 1988
MM74C925 MM74C926 MM74C927 MM74C928
4-Digit Counters with Multiplexed
7-Segment Output Drivers
General Description
These CMOS counters consist of a 4-digit counter an inter-
nal output latch NPN output sourcing drivers for a 7-seg-
ment display and an internal multiplexing circuitry with four
multiplexing outputs The multiplexing circuit has its own
free-running oscillator and requires no external clock The
counters advance on negative edge of clock A high signal
on the Reset input will reset the counter to zero and reset
the carry-out low A low signal on the Latch Enable input will
latch the number in the counters into the internal output
latches A high signal on Display Select input will select the
number in the counter to be displayed a low level signal on
the Display Select will select the number in the output latch
to be displayed
The MM74C925 is a 4-decade counter and has Latch En-
able Clock and Reset inputs
The MM74C926 is like the MM74C925 except that it has a
display select and a carry-out used for cascading counters
The carry-out signal goes high at 6000 goes back low at
0000
The MM74C927 is like the MM74C926 except the second
most significant digit divides by 6 rather than 10 Thus if the
clock input frequency is 10 Hz the display would read
tenths of seconds and minutes (ie 9599)
The MM74C928 is like the MM74C926 except the most sig-
nificant digit divides by 2 rather than 10 and the carry-out is
an overflow indicator which is high at 2000 and it goes back
low only when the counter is reset Thus this is a 3
-digit
counter
Features
Y
Wide supply voltage range
3V to 6V
Y
Guaranteed noise margin
1V
Y
High noise immunity
045 VCC (typ)
Y
High segment sourcing current
40 mA
VCC b 16V VCC e 5V
Y
Internal multiplexing circuitry
Design Considerations
Segment resistors are desirable to minimize power dissipa-
tion and chip heating The DS75492 serves as a good digit
driver when it is desired to drive bright displays When using
this driver with a 5V supply at room temperature the display
can be driven without segment resistors to full illumination
The user must use caution in this mode however to prevent
overheating of the device by using too high a supply voltage
or by operating at high ambient temperatures
The input protection circuitry consists of a series resistor
and a diode to ground Thus input signals exceeding VCC
will not be clamped This input signal should not be allowed
to exceed 15V
Connection Diagrams
Dual-In-Line Package
TLF5919 – 1
Top View
Order Number MM74C925
Dual-In-Line Package
TLF5919 – 2
Top View
Order Number MM74C926
MM74C927 or MM74C928
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MM74C928N | 功能描述:计数器 IC 4-Digit Counters RoHS:否 制造商:NXP Semiconductors 计数器类型:Binary Counters 逻辑系列:74LV 位数:10 计数法: 计数顺序: 工作电源电压:1 V to 5.5 V 工作温度范围:- 40 C to + 125 C 封装 / 箱体:SOT-109 封装:Reel |
| MM74C93 | 制造商:Panasonic Industrial Company 功能描述:I.C. |
| MM74C932 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Phase Comparator |
| MM74C932N | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Phase Comparator |
| MM74C93J | 制造商:NSC 制造商全称:National Semiconductor 功能描述:4-Bit Decade, Binary Counter |
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