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參數(shù)資料
| 型號(hào)： | 74F385 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Quad serial adder/subtractor |
| 中文描述： | 四串行加法器/減法 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 64K |
| 代理商： | 74F385 |
Philips Semiconductors
Product specification
74F385
Quad serial adder/subtractor
1
1989 Sep 20
853–0868 97678
FEATURES
Four independent adders/subtractors
Two’s complement arithmetic
Synchronous operation
Common Clear and Clock
74F385 is designed for use with serial multipliers in implementing
digital filters and butterfly networks in fast Fourier transforms
DESCRIPTION
The 74F385 contains four independent adder/subtractor elements
with common Clock and Master Reset. Each adder/subtractor
contains a sum flop-flop and a carry flip-flop for synchronous
operations. Flip-flop state changes occur on the rising edge of the
Clock Pulse (CP) input signal. The Select (S) input should be Low
for the Add (A plus B) mode and High for the Subtract (A minus B)
mode. A Low signal on the asynchronous Master Reset (MR) input
clears the sum flip-flop and resets the Carry flip-flop to zero in the
Add mode or presets it to one in the Subtract mode.
PIN CONFIGURATION
20
19
18
17
16
15
14
7
6
5
4
3
2
1
13
8
V
CC
CP
F0
S0
B0
A0
A1
B1
S1
F1
GND
F3
S3
B3
A3
A2
B2
S2
F2
MR
SF00928
12
9
11
10
TYPE
TYPICAL f
MAX
TYPICAL SUPPLY
CURRENT (TOTAL)
74F385
140 MHz
55mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%, T
amb
= 0
°
C to +70
°
C
N74F385N
20-pin plastic DIP
20-pin plastic SO
N74F385D
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS
DESCRIPTION
74F (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
A0 – A3
A operand inputs
1.0/1.0
20
μ
A/0.6mA
20
μ
A/0.6mA
20
μ
A/0.6mA
20
μ
A/0.6mA
20
μ
A/0.6mA
B0 – B3
B operand inputs
1.0/1.0
S0 – S3
Function select inputs
1.0/1.0
CP
Clock pulse input (active rising edge)
1.0/1.0
MR
Asynchronous Master Reset input (active Low)
1.0/1.0
F0–F3
Sum or difference outputs
50/33
1.0mA/20mA
NOTE:
One (1.0) FAST unit load is defined as: 20
μ
A in the High state and 0.6mA in the Low state.
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| 74F38PC | 功能描述:邏輯門 Qd 2-Input NAND Buf RoHS:否 制造商:Texas Instruments 產(chǎn)品:OR 邏輯系列:LVC 柵極數(shù)量:2 線路數(shù)量（輸入/輸出）:2 / 1 高電平輸出電流:- 16 mA 低電平輸出電流:16 mA 傳播延遲時(shí)間:3.8 ns 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DCU-8 封裝:Reel |
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