- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382335 > MM74C928 (National Semiconductor Corporation) 4-Digit Counters with Multiplexed 7-Segment Output Drivers PDF資料下載
參數(shù)資料
| 型號(hào)： | MM74C928 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | 4-Digit Counters with Multiplexed 7-Segment Output Drivers |
| 中文描述： | 4位計(jì)數(shù)器與復(fù)用7段輸出驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | MM74C928 |
TL/F/5919
M
w
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 (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
(/2
-digit
counter.
Features
Y
Wide supply voltage range
3V to 6V
Y
Guaranteed noise margin
1V
Y
High noise immunity
0.45 V
CC
(typ.)
Y
High segment sourcing current
40 mA
@
V
CC
b
1.6V, V
CC
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 V
CC
will not be clamped. This input signal should not be allowed
to exceed 15V.
Connection Diagrams
Dual-In-Line Package
TL/F/5919–1
Top View
Order Number MM74C925
Dual-In-Line Package
TL/F/5919–2
Top View
Order Number MM74C926,
MM74C927 or MM74C928
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MM74C95 | 4-Bit Right-Shift Left-Shift Register |
| MM74C95J | 4-Bit Right-Shift Left-Shift Register |
| MM74C95N | 4-Bit Right-Shift Left-Shift Register |
| MM54C95 | 4-Bit Right-Shift Left-Shift Register |
| MM54C95J | 4-Bit Right-Shift Left-Shift Register |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MM74C928N | 功能描述:計(jì)數(shù)器 IC 4-Digit Counters RoHS:否 制造商:NXP Semiconductors 計(jì)數(shù)器類型:Binary Counters 邏輯系列:74LV 位數(shù):10 計(jì)數(shù)法: 計(jì)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 |
| MM74C93 | 制造商:Panasonic Industrial Company 功能描述:I.C. |
| MM74C932 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Phase Comparator |
| MM74C932N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Phase Comparator |
| MM74C93J | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4-Bit Decade, Binary Counter |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。