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參數(shù)資料
| 型號： | 74HC299 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit universal shift register; 3-state |
| 中文描述： | 8位通用移位寄存器;三態(tài) |
| 文件頁數(shù)： | 2/11頁 |
| 文件大?。?/td> | 85K |
| 代理商： | 74HC299 |
December 1990
2
Philips Semiconductors
Product specification
8-bit universal shift register; 3-state
74HC/HCT299
FEATURES
Multiplexed inputs/outputs provide improved bit density
Four operating modes:
– shift left
– shift right
– hold (store)
– load data
Operates with output enable or at high-impedance
OFF-state (Z)
3-state outputs drive bus lines directly
Can be cascaded for n-bits word length
Output capability: bus driver (parallel I/Os),
standard (serial outputs)
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT299 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT299 contain eight edge-triggered D-type
flip-flops and the interstage logic necessary to perform
synchronous shift-right, shift-left, parallel load and hold
operations. The type of operation is determined by the
mode select inputs (S
0
and S
1
), as shown in the mode
select table.
All flip-flop outputs have 3-state buffers to separate these
outputs (I/O
0
to I/O
7
) such, that they can serve as data
inputs in the parallel load mode. The serial outputs (Q
0
and
Q
7
) are used for expansion in serial shifting of longer
words.
A LOW signal on the asynchronous master reset input
(MR) overrides the S
n
and clock (CP) inputs and resets the
flip-flops. All other state changes are initiated by the rising
edge of the clock pulse. Inputs can change when the clock
is either state, provided that the recommended set-up and
hold times, relative to the rising edge of CP, are observed.
A HIGH signal on the 3-state output enable inputs (OE
1
or
OE
2
) disables the 3-state buffers and the I/O
n
outputs are
set to the high-impedance OFF-state. In this condition, the
shift, hold, load and reset operations can still occur. The
3-state buffers are also disabled by HIGH signals on both
S
0
and S
1
, when in preparation for a parallel load
operation.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL/
t
PLH
propagation delay
CP to Q
0
, Q
7
CP to I/O
n
MR to Q
0
, Q
7
or I/O
n
maximum clock frequency
input capacitance
input/output capacitance
power dissipation capacitance per package
C
L
= 15 pF; V
CC
= 5 V
20
20
20
50
3.5
10
120
19
19
23
46
3.5
10
125
ns
ns
ns
MHz
pF
pF
pF
t
PHL
f
max
C
I
C
I/O
C
PD
notes 1 and 2
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
2.
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
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package
Information”
.
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| 74HC299D | 功能描述:計數(shù)器移位寄存器 8-BIT UNIVERSAL SHFT REG 3-S 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 |
| 74HC299D,652 | 功能描述:計數(shù)器移位寄存器 8-BIT UNIVERSAL SHFT 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 |
| 74HC299D,653 | 功能描述:計數(shù)器移位寄存器 8-BIT UNIVERSAL SHFT REG 3-S 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 |
| 74HC299DB | 功能描述:計數(shù)器移位寄存器 8-BIT UNVSL SHFT REG 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 |
| 74HC299DB,112 | 功能描述:計數(shù)器移位寄存器 8-BIT UNVSL SHFT REG 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 |
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