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Details, datasheet, quote on part number:N74456D
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Datasheet text preview:
INTEGRATED CIRCUITS
74F455*, 74F456 Buffers/drivers
* Discontinued part. Please see the Discontinued Product List.
Product specification Supersedes data of 1990 Nov 26 IC15 Data Handbook
1999 Jan 08
Philips Semiconductors
Philips Semiconductors
Product specification
Buffers/Drivers
74F455 Octal Buffer/Driver with Parity, Inverting (3-State) 74F456 Octal Buffer/Driver with Parity, Non-Inverting (3-State)
FEATURES
74F455,* 74F456
· High impedance NPN base inputs for reduced loading
(40µA in High and Low states)
DESCRIPTION
The 74F455 and 74F456 are octal buffers and line drivers with parity generation/checking designed to be employed as memory address drivers, clock drivers and bus-oriented transmitters/receivers. These parts include parity generator/checker to improve PC board density. TYPICAL PROPAGATION DELAY 6.5ns 7.5ns
· 74F456 combines 74F244 and 74F280A functions in one package · 74F456 is a center pin version of the 74F656A · 74F456 Non-Inverting · 3-State outputs sink 64mA and source 15mA · 24-pin plastic Slim DIP (300 mil) package · Broadside pinout simplifies PC board layout
TYPE 74F455 74F456
TYPICAL SUPPLY CURRENT (TOTAL) 64mA 64mA
ORDERING INFORMATION
DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74456N N74456D PKG DWG #
24-pin plastic Slim DIP (300mil) 24-pin plastic SOL
SOT222-1 SOT137-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS D0D7 PI OE0, OE1 E, O Q0Q7 Data inputs Parity input Output Enable inputs (active Low) Parity outputs Data outputs (75F455) DESCRIPTION 74F(U.L.) HIGH/LOW 2.0/0.066 1.0/0.033 1.0/0.033 750/106.7 750/106.7 LOAD VALUE HIGH/LOW 40µA/40µA 20µA/20µA 20µA/20µA 15mA/64mA 15mA/64mA 15mA/64mA
Q0Q7 Data outputs (75F456) 750/106.7 NOTE: One (1.0) FAST Unit Load (U.L.) is defined as 20µA in the High state and 0.6mA in the Low state.
PIN CONFIGURATION 74F455
OE0 OE1 PI D0 D1 D2 VCC D3 D4 D5 D6 D7 1 2 3 4 5 6 7 8 9 10 11 12 24 O 23 E 22 Q0 21 Q1 20 Q2 19 GND 18 GND 17 Q3 16 Q4 15 Q5 14 Q6 13 Q7
PIN CONFIGURATION 74F456
OE0 OE1 PI D0 D1 D2 VCC D3 D4 D5 D6 D7 1 2 3 4 5 6 7 8 9 10 11 12 24 O 23 E 22 Q0 21 Q1 20 Q2 19 GND 18 GND 17 Q3 16 Q4 15 Q5 14 Q6 13 Q7
SF00969
SF00958
* Discontinued part. Please see the Discontinued Products List. 1999 Jan 08
2
8530371 20616
Philips Semiconductors
Product specification
Buffers/Drivers
74F455,* 74F456
LOGIC SYMBOL 74F455
4 5 6 8 9 10 11 12
LOGIC SYMBOL 74F456
4 5 6 8 9 10 11 12
D0 3 1 2 PI OE0
D1
D2
D3
D4
D5
D6
D7 3 23 1 24 2
D0 PI OE0
D1
D2
D3
D4
D5
D6
D7
E O
E O
23 24
OE1 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
OE1 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
22 VCC = Pin 7 GND = Pin 18, 19
21
20
17
16
15
14
13
SF00959
22 VCC = Pin 7 GND = Pin 18, 19
21
20
17
16
15
14
13
SF00960
LOGIC SYMBOL (IEEE/IEC) 74F455
3,5,6,7,8 9,10,11,12 3 1 2 4 5 6 8 9 10 11 12 3,5,6,7,8 9,10,11,12 2K [EVEN] [ODD] 23 24
LOGIC SYMBOL (IEEE/IEC) 74F456
3,5,6,7,8 9,10,11,12 3 1 P3 1 EN4 22 21 20 17 16 15 14 13 3,5,6,7,8 9,10,11,12 2K [EVEN] [ODD] 23 24
P3 w1
EN4 22 21 20 17 16 15 14 13
2 4 5 6 8 9 10 11 12
Z5 Z6 Z7 Z8 Z9 Z10 Z11 Z12
4
Z5 Z6 Z7 Z8 Z9 Z10 Z11 Z12
4
SF00961
SF00962
FUNCTION TABLE
INPUTS OUTPUTS 74F455 OE0 L L H X H L Z X = = = = OE1 L L X H Dn L H X X Qn H L Z Z 74F456 Qn L H Z Z
FUNCTION TABLE for PARITY OUTPUTS
INPUTS Number of inputs, High (PI, D0 - D7) Even - 0, 2, 4, 6, 8 Odd - 1, 3, 5, 7, 9 Any OEn = High H L Z X = = = = High voltage level Low voltage level High impedance "off" state Don't care E H L Z OUTPUTS O L H Z
High voltage level Low voltage level High impedance "off" state Don't care
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08 3
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