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參數(shù)資料
| 型號： | 74HC40103DB |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-bit synchronous binary down counter |
| 中文描述： | 8位同步二進制計數(shù)器下降 |
| 文件頁數(shù)： | 2/17頁 |
| 文件大?。?/td> | 136K |
| 代理商： | 74HC40103DB |
1998 Jul 08
2
Philips Semiconductors
Product specification
8-bit synchronous binary down counter
74HC/HCT40103
FEATURES
Cascadable
Synchronous or asynchronous preset
Output capability: standard
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT40103 are high-speed Si-gate CMOS
devices and are pin compatible with the “40103” of the
“4000B” series. They are specified in compliance with
JEDEC standard no. 7A.
The 74HC/HCT40103 consist each of an 8-bit
synchronous down counter with a single output which is
active when the internal count is zero. The “40103”
contains a single 8-bit binary counter and has control
inputs for enabling or disabling the clock (CP), for clearing
the counter to its maximum count, and for presetting the
counter either synchronously or asynchronously. All
control inputs and the terminal count output (TC) are
active-LOW logic.
In normal operation, the counter is decremented by one
count on each positive-going transition of the clock (CP).
Counting is inhibited when the terminal enable input (TE)
is HIGH. The terminal count output (TC) goes LOW when
the count reaches zero ifTE is LOW, and remains LOW for
one full clock period.
When the synchronous preset enable input (PE) is LOW,
data at the jam input (P
0
to P
7
) is clocked into the counter
on the next positive-going clock transition regardless of the
state of TE. When the asynchronous preset enable input
(PL) is LOW, data at the jam input (P
0
to P
7
) is
asynchronously forced into the counter regardless of the
state of PE, TE, or CP. The jam inputs (P
0
to P
7
) represent
a single 8-bit binary word.
When the master reset input (MR) is LOW, the counter is
asynchronously cleared to its maximum count (decimal
255) regardless of the state of any other input. The
precedence relationship between control inputs is
indicated in the function table.
If all control inputs except TE are HIGH at the time of zero
count, the counters will jump to the maximum count, giving
a counting sequence of 256 clock pulses long.
The “40103” may be cascaded using the TE input and the
TC output, in either a synchronous or ripple mode.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
1.5 V
2.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/ t
PLH
f
max
C
I
C
PD
propagation delay CP to TC
maximum clock frequency
input capacitance
power dissipation capacitance per package
C
L
= 15 pF; V
CC
= 5 V
30
32
3.5
24
30
31
3.5
27
ns
MHz
pF
pF
notes 1 and 2
相關PDF資料 |
PDF描述 |
|---|---|
| 74HC40103N | 8-bit synchronous binary down counter |
| 74HC40103PW | 8-bit synchronous binary down counter |
| 74HCT40103 | 8-bit synchronous binary down counter |
| 74HCT40103D | 8-bit synchronous binary down counter |
| 74HCT40103DB | 8-bit synchronous binary down counter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 74HC40103DB,112 | 功能描述:計數(shù)器 IC 8-BIT SYNC BINARY 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 |
| 74HC40103DB,118 | 功能描述:計數(shù)器移位寄存器 8-BIT SYNC BINARY 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 |
| 74HC40103DB-T | 功能描述:計數(shù)器 IC 8-BIT SYNC BINARY DOWN COUNTER 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 |
| 74HC40103D-T | 制造商:NXP Semiconductors 功能描述:Counter Single 8-Bit Sync/Async Binary Down 16-Pin SO T/R |
| 74HC40103N | 制造商:NXP Semiconductors 功能描述:HC Counter 制造商:NXP Semiconductors 功能描述:HC Counter Bulk 制造商:NXP Semiconductors 功能描述:IC 74HC CMOS 74HC40103 DIP16 5V 制造商:NXP Semiconductors 功能描述:IC, 74HC CMOS, 74HC40103, DIP16, 5V 制造商:NXP Semiconductors 功能描述:IC, 74HC CMOS, 74HC40103, DIP16, 5V; Counter Type:Binary; Clock Frequency:35MHz; Count Maximum:255; Supply Voltage Min:2V; Supply Voltage Max:6V; Logic Case Style:DIP; No. of Pins:16; Operating Temperature Min:-40C; Operating ;RoHS Compliant: Yes 制造商:NXP Semiconductors 功能描述:Counter Single 8-Bit Sync/Async Binary Down 16-Pin PDIP Bulk |
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