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參數(shù)資料
| 型號： | MM74C925N |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 4-Digit Counters with Multiplexed |
| 中文描述： | CMOS SERIES, ASYN NEGATIVE EDGE TRIGGERED 16-BIT UP DISPLAY DRIVER COUNTER, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001, DIP-16 |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 97K |
| 代理商： | MM74C925N |
October 1987
Revised January 1999
M
1999 Fairchild Semiconductor Corporation
DS005919.prf
www.fairchildsemi.com
MM74C925 MM74C926 MM74C927 MM74C928
4-Digit Counters with Multiplexed
7-Segment Output Drivers
General Description
The MM74C925, MM74C926, MM74C927 and MM74C928
CMOS counters consist of a 4-digit counter, an internal out-
put latch, NPN output sourcing drivers for a 7-segment dis-
play, 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 sig-
nal 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
Enable, 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 (i.e., 9:59.9).
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
I
Wide supply voltage range:
I
Guaranteed noise margin:
I
High noise immunity:
3V to 6V
1V
0.45 V
CC
(typ.)
I
High segment sourcing current:
@ V
CC
1.6V, V
CC
=
5V
I
Internal multiplexing circuitry
40 mA
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 illu-
mination. 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 tempera-
tures.
The input protection circuitry consists of a series resistor,
and a diode to ground. Thus input signals exceeding V
CC
will not be clamped. This input signal should not be allowed
to exceed 15V.
Ordering Code:
Order Number
MM74C925N
MM74C926N
MM74C927N
MM74C928N
Package Number
N16E
N18A
N18A
N18A
Package Description
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
相關PDF資料 |
PDF描述 |
|---|---|
| MM74C926 | 4-Digit Counters with Multiplexed |
| MM74C926N | 4-Digit Counters with Multiplexed |
| MM74C927N | 4-Digit Counters with Multiplexed |
| MM74C928N | 4-Digit Counters with Multiplexed |
| MM74C93 | 4-Bit Decade Counter 4-Bit Binary Counter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MM74C926 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4-Digit Counters with Multiplexed 7-Segment Output Drivers |
| MM74C926N | 功能描述:計數(shù)器移位寄存器 4-Digit Counters RoHS:否 制造商:Texas Instruments 計數(shù)器類型: 計數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
| MM74C926N_Q | 功能描述:計數(shù)器 IC 4-Digit Counters RoHS:否 制造商:NXP Semiconductors 計數(shù)器類型:Binary Counters 邏輯系列:74LV 位數(shù):10 計數(shù)法: 計數(shù)順序: 工作電源電壓:1 V to 5.5 V 工作溫度范圍:- 40 C to + 125 C 封裝 / 箱體:SOT-109 封裝:Reel |
| MM74C927 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4-Digit Counters with Multiplexed 7-Segment Output Drivers |
| MM74C927N | 功能描述:計數(shù)器移位寄存器 12-Bit Approx Reg RoHS:否 制造商:Texas Instruments 計數(shù)器類型: 計數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
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