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參數資料
| 型號： | MC74HC161A |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 通用總線功能 |
| 英文描述： | Presettable Counters |
| 中文描述： | 可預置計數器 |
| 文件頁數： | 6/16頁 |
| 文件大小： | 284K |
| 代理商： | MC74HC161A |
MC74HC161A, MC74HC163A
http://onsemi.com
6
FUNCTION DESCRIPTION
The HC161A/163A are programmable 4–bit synchronous
counters that feature parallel Load, synchronous or
asynchronous Reset, a Carry Output for cascading and
count–enable controls.
The HC161A and HC163A are binary counters with
asynchronous Reset and synchronous Reset, respectively.
INPUTS
Clock (Pin 2)
The internal flip–flops toggle and the output count
advances with the rising edge of the Clock input. In addition,
control functions, such as resetting and loading occur with
the rising edge of the Clock input.
Preset Data Inputs P0, P1, P2, P3 (Pins 3, 4, 5, 6)
These are the data inputs for programmable counting.
Data on these pins may be synchronously loaded into the
internal flip–flops and appear at the counter outputs. P0 (Pin
3) is the least–significant bit and P3 (Pin 6) is the
most–significant bit.
OUTPUTS
Q0, Q1, Q2, Q3 (Pins 14, 13, 12, 11)
These are the counter outputs. Q0 (Pin 14) is the
least–significant bit and Q3 (Pin 11) is the most–significant
bit.
Ripple Carry Out (Pin 15)
When the counter is in its maximum state 1111, this output
goes high, providing an external look–ahead carry pulse that
may be used to enable successive cascaded counters. Ripple
Carry Out remains high only during the maximum count
state. The logic equation for this output is:
Ripple Carry Out = Enable T
Q0
Q1
Q2
Q3
CONTROL FUNCTIONS
Resetting
A low level on the Reset pin (Pin 1) resets the internal
flip–flops and sets the outputs (Q0 through Q3) to a low
level. The HC161A resets asynchronously, and the HC163A
resets with the rising edge of the Clock input (synchronous
reset).
Loading
With the rising edge of the Clock, a low level on Load (Pin
9) loads the data from the Preset Data input pins (P0, P1, P2,
P3) into the internal flip–flops and onto the output pins, Q0
through Q3. The count function is disabled as long as Load
is low.
Count Enable/Disable
These devices have two count–enable control pins:
Enable P (Pin 7) and Enable T (Pin 10). The devices count
when these two pins and the Load pin are high. The logic
equation is:
Count Enable = Enable P
Enable T
Load
The count is either enabled or disabled by the control
inputs according to Table 1. In general, Enable P is a
count–enable control: Enable T is both a count–enable and
a Ripple–Carry Output control.
Table 1. Count Enable/Disable
Control Inputs
Result at Outputs
Load
Enable P
Enable T
Q0 – Q3
Ripple Carry Out
H
H
H
Count
High when Q0–Q3
are maximum*
L
H
H
No
Count
X
L
H
No
Count
High when Q0–Q3
are maximum*
X
X
L
No
Count
L
*Q0 through Q3 are maximum when Q3 Q2 Q1 Q0 = 1111.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
OUTPUT STATE DIAGRAMS
Binary Counters
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MC74HC161AD | 制造商:Rochester Electronics LLC 功能描述: |
| MC74HC161ADG | 功能描述:計數器 IC Binary Counters 4Bit Asynchronous RoHS:否 制造商:NXP Semiconductors 計數器類型:Binary Counters 邏輯系列:74LV 位數:10 計數法: 計數順序: 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 |
| MC74HC161ADR2 | 功能描述:IC COUNTER 4BIT PRESET 16SOIC RoHS:否 類別:集成電路 (IC) >> 邏輯 -計數器，除法器 系列:74HC 產品變化通告:1Q2012 Discontinuation 30/Mar/2012 標準包裝:2,500 系列:74HC 邏輯類型:二進制計數器 方向:上 元件數:1 每個元件的位元數:12 復位:異步 計時:- 計數速率:50MHz 觸發器類型:負邊沿 電源電壓:2 V ~ 6 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| MC74HC161ADR2G | 功能描述:計數器 IC Binary Counters 4Bit Asynchronous RoHS:否 制造商:NXP Semiconductors 計數器類型:Binary Counters 邏輯系列:74LV 位數:10 計數法: 計數順序: 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 |
| MC74HC161ADT | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel 制造商:ON Semiconductor 功能描述: |
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