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| 型号： | SN74LS161AN3 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 计数器 |
| 英文描述： | LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDIP16 |
| 封装： | DIP-16 |
| 文件页数： | 17/26页 |
| 文件大小： | 803K |
| 代理商： | SN74LS161AN3 |
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SN74LS161A, SYNCHRONOUS 4-BIT BINARY COUNTERS
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Parameter Name SN74LS161A
Voltage Nodes (V) 5
Vcc range (V)
4.75 to 5.25
Input Level
TTL
Output Level
TTL
Output Drive (mA) -0.4/8
Output
2S
Clear
Async
These synchronous, presettable counters feature an internal carry look-ahead for application
in high-speed counting designs. The '160, '162, 'LS160A, 'LS162A, and 'S162 are decade
counters and the '161, '163, 'LS161A, 'LS163A, and 'S163 are 4-bit binary counters.
Synchronous operation is provided by having all flip-flops clocked simultaneously so that
the outputs change coincident with each other when so instructed by the count-enable inputs
and internal gating. This mode of operation eliminates the output counting spikes that are
normally associated with asynchronous (ripple clock) counters, however counting spikes
may occur on the (RCO) ripple carry output. A buffered clock input triggers the four flip-
flops on the rising edge of the clock input waveform.
These counters are fully programmable; that is, the outputs may be preset to either level. As
presetting is synchronous, setting up a low level at the load input disables the counter and
causes the outputs to agree with the setup data after the next clock pulse regardless of the
levels of the enable inputs. Low-to-high transitions at the load input of the '160 thru '163
should be avoided when the clock is low if the enable inputs are high at or before the
transition. This restriction is not applicable to the 'LS160A thru 'LS163A or 'S162 or 'S163.
The clear function for the '160, '161, 'LS160A, and 'LS161A is asynchronous and a low level
at the clear input sets all four of the flip-flop outputs low regardless of the levels of clock,
load, or enable inputs. The clear function for the '162, '163, 'LS162A, 'LS163A, 'S162, and
'S163 is synchronous and a low level at the clear input sets all four of the flip-flop outputs
low after the next clock pulse, regardless of the levels of the enable inputs. This synchronous
clear allows the count length to be modified easily as decoding the maximum count desired
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74LS161ANE4 | 功能描述:计数器 IC 4-Bit Synchronous Binary 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 |
| SN74LS161ANS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| SN74LS161ANSR | 功能描述:计数器 IC 4-Bit Synchronous Binary 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 |
| SN74LS161ANSRE4 | 功能描述:计数器 IC 4-Bit Synchronous Binary 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 |
| SN74LS161ANSRG4 | 功能描述:计数器 IC Sync 4B Binary 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 |
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