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參數(shù)資料
| 型號(hào)： | SN54F74FK |
| 廠商： | Texas Instruments, Inc. |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | RTC Module With 32Kx8 NVSRAM 28-DIP MODULE 0 to 70 |
| 中文描述： | 雙上升沿觸發(fā)的D型倒裝有明確和預(yù)置觸發(fā)器 |
| 文件頁(yè)數(shù)： | 1/6頁(yè) |
| 文件大?。?/td> | 100K |
| 代理商： | SN54F74FK |
SN54F74, SN74F74
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
SDFS046A – MARCH 1987 – REVISED OCTOBER 1993
Copyright
1993, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
These devices contain two independent positive-
edge-triggered D-type flip-flops. A low level at the
preset (PRE) or clear (CLR) inputs sets or resets
the outputs regardless of the levels of the other
inputs. When PRE and CLR are inactive (high),
data at the data (D) input meeting the setup time
requirements is transferred to the outputs on the
positive-going edge of the clock pulse. Clock
triggering occurs at a voltage level and is not
directly related to the rise time of the clock pulse.
Following the hold-time interval, data at the
D input may be changed without affecting the
levels at the outputs.
The SN54F74 is characterized for operation over
the full military temperature range of –55
°
C to
125
°
C. The SN74F74 is characterized for
operation from 0
°
C to 70
°
C.
FUNCTION TABLE
INPUTS
OUTPUTS
PRE
CLR
CLK
D
Q
Q
L
H
X
X
H
L
H
L
X
X
L
H
H
L
L
X
↑
↑
L
X
H
H
H
H
H
L
H
H
L
L
H
H
H
X
Q0
Q0
The output levels are not guaranteed to meet the
minimum levels for VOH. Furthermore, this
configuration is nonstable; that is, it will not persist
when PRE or CLR returns to its inactive (high)
level.
SN54F74 . . . J PACKAGE
SN74F74 . . . D OR N PACKAGE
(TOP VIEW)
SN54F74 . . . FK PACKAGE
(TOP VIEW)
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
2D
NC
2CLK
NC
2PRE
1CLK
NC
1PRE
NC
1Q
1
1
N
2
2
V
2
1
G
N
NC – No internal connection
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1CLR
1D
1CLK
1PRE
1Q
1Q
GND
V
CC
2CLR
2D
2CLK
2PRE
2Q
2Q
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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