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參數資料
| 型號： | DM74ALS163BMX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous Up Counter |
| 中文描述： | ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO16 |
| 封裝： | 0.150 INCH, MS-012, SOIC-16 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 92K |
| 代理商： | DM74ALS163BMX |
2000 Fairchild Semiconductor Corporation
DS006206
www.fairchildsemi.com
April 1984
Revised February 2000
D
DM74ALS161B DM74ALS162B DM74ALS163B
Synchronous Four-Bit Counter
General Description
These synchronous presettable counters feature an inter-
nal carry look ahead for application in high speed counting
designs. The DM74ALS162B is a four-bit decade counter,
while the DM74ALS161B and DM74ALS163B are four-bit
binary counters. The DM74ALS161B clears asynchro-
nously, while the DM74ALS162B and DM74ALS163B clear
synchronously. The carry output is decoded to prevent
spikes during normal counting mode of operation. Synchro-
nous operation is provided by having all flip-flops clocked
simultaneously so that outputs change coincident with
each other when so instructed by count enable inputs and
internal gating. This mode of operation eliminates the out-
put counting spikes which are normally associated with
asynchronous (ripple clock) counters. A buffered clock
input triggers the four flip-flops on the rising (positive-
going) 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 set up data after the
next clock pulse regardless of the levels of enable input.
LOW-to-HIGH transitions at the load input are perfectly
acceptable regardless of the logic levels on the clock or
enable inputs.
The DM74ALS161B clear function is asynchronous. 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. These two counters are provided with a clear on
power-up feature. The DM74ALS162B and DM74ALS163B
clear function 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 enable inputs. This
synchronous clear allows the count length to be modified
easily, as decoding the maximum count desired can be
accomplished with one external NAND gate. The gate out-
put is connected to the clear input to synchronously clear
the counter to all low outputs. LOW-to-HIGH transitions at
the clear input of the DM74ALS162B and DM74ALS163B
are also permissible regardless of the levels of logic on the
clock, enable or load inputs.
The carry look ahead circuitry provides for cascading
counters for n bit synchronous application without addi-
tional gating. Instrumental in accomplishing this function
are two count enable inputs (P and T) and a ripple carry
output. Both count enable inputs must be HIGH to count.
The T input is fed forward to enable the ripple carry output.
The ripple carry output thus enabled will produce a high
level output pulse with a duration approximately equal to
the high level portion of QA output. This high level overflow
ripple carry pulse can be used to enable successive cas-
caded stages. HIGH-to-LOW level transitions at the enable
P
or
T
inputs
of
the
DM74ALS163B may occur regardless of the logic level on
the clock.
The DM74ALS161B through DM74ALS163B feature a fully
independent clock circuit. changes made to control inputs
(enable P or T, or load) that will modify the operating mode
will have no effect until clocking occurs. The function of the
counter (whether enabled, disabled, loading or counting)
will be dictated solely by the conditions meeting the stable
set-up and hold times.
DM74ALS161B
through
Features
I
Switching specifications at 50 pF
I
Switching specifications guaranteed over full tempera-
ture and V
CC
range
I
Advanced oxide-isolated, ion-implanted Schottky TTL
process
I
Functionally and pin-for-pin compatible with Schottky
and low power Schottky TTL counterpart
I
Improved AC performance over Schottky and low power
Schottky counterparts
I
Synchronously programmable
I
Internal look ahead for fast counting
I
Carry output for n-bit cascading
I
Synchronous counting
I
Load control line
I
ESD inputs
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number
DM74ALS161BM
DM74ALS161BN
DM74ALS162BM
DM74ALS162BN
DM74ALS163BM
DM74ALS163BN
Package Number
M16A
N16E
M16A
N16E
M16A
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
相關PDF資料 |
PDF描述 |
|---|---|
| DM74ALS162B | Synchronous Four-Bit Decade Counter(同步4位十進制計數器) |
| DM74ALS161B | Synchronous Four-Bit Binary Counter(同步4位二進制計數器) |
| DM74ALS163B | Synchronous Four-Bit Binary Counter(同步4位二進制計數器) |
| DM74ALS161BM | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear And Preset 14-TSSOP -40 to 85 |
| DM74ALS161BN | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear And Preset 14-TSSOP -40 to 85 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DM74ALS163BN | 功能描述:計數器移位寄存器 Syn 4-Bit Binary Ctr RoHS:否 制造商:Texas Instruments 計數器類型: 計數順序:Serial to Serial/Parallel 電路數量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數量: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 |
| DM74ALS163BN/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Synchronous Up Counter |
| DM74ALS163BN/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Synchronous Up Counter |
| DM74ALS163BN_Q | 功能描述:計數器 IC Syn 4-Bit Binary Ctr 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 |
| DM74ALS163J/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Synchronous Up Counter |
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