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NXP Semiconductors Electronic Components Datasheet

74ABT845 Datasheet

8-bit bus interface latch

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Philips Semiconductors
8-bit bus interface latch with set and reset
(3-State)
Product specification
74ABT845
FEATURES
High speed parallel latches
Ideal where high speed, light loading, or increased fan-in are
required with MOS microprocessors
Broadside pinout
Output capability: +64mA/–32mA
Power-up 3-State
Power-up reset
Latch-up protection exceeds 500mA per Jedec Std 17
ESD protection exceeds 2000 V per MIL STD 883 Method 3015
and 200 V per Machine Model
DESCRIPTION
The 74ABT845 consists of eight D-type latches with 3-State outputs.
In addition to the LE, OE, MR and PRE pins, the 74ABT845 has two
additional OE pins, making a total of three Output Enable (OE0,
OE1, OE2) pins. The multiple Output enables allow multiuser control
of the interface, e.g., CS, DMA, and RD/WR.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
tPLH
tPHL
CIN
COUT
ICCZ
Propagation delay
Dn to Qn
Input capacitance
Output capacitance
Total supply current
CONDITIONS
Tamb = 25°C; GND = 0V
CL = 50pF; VCC = 5V
VI = 0V or VCC
Outputs disabled;
VO = 0V or VCC
Outputs disabled; VCC = 5.5V
TYPICAL
5.4
4
7
500
UNIT
ns
pF
pF
nA
ORDERING INFORMATION
PACKAGES
24-Pin Plastic DIP
24-Pin plastic SO
24-Pin Plastic SSOP Type II
24-Pin Plastic TSSOP Type I
TEMPERATURE RANGE OUTSIDE NORTH AMERICA
–40°C to +85°C
74ABT845 N
–40°C to +85°C
74ABT845 D
–40°C to +85°C
74ABT845 DB
–40°C to +85°C
74ABT845 PW
NORTH AMERICA
74ABT845 N
74ABT845 D
74ABT845 DB
74ABT845PW DH
DWG NUMBER
SOT222-1
SOT137-1
SOT340-1
SOT355-1
PIN CONFIGURATION
OE0 1
OE1 2
D0 3
D1 4
D2 5
D3 6
D4 7
D5 8
D6 9
D7 10
MR 11
GND 12
24 VCC
23 OE2
22 Q0
21 Q1
20 Q2
19 Q3
18 Q4
17 Q5
16 Q6
15 Q7
14 PRE
13 LE
TOP VIEW
PIN DESCRIPTION
PIN NUMBER SYMBOL
FUNCTION
1, 2, 23
OE0 – OE2
Output enable inputs
(active-Low)
3, 4, 5, 6,
7, 8, 9, 10
D0-D7 Data inputs
22, 21, 20, 19,18,
17, 16, 15
Q0-Q7
Data outputs
11 MR Master reset input (active-Low)
13
LE
Latch enable input
(active-High)
14
PRE
Preset input (active-Low)
12 GND Ground (0V)
24 VCC Positive supply voltage
SA00258
1995 Sep 06
1 853-1703 15702


NXP Semiconductors Electronic Components Datasheet

74ABT845 Datasheet

8-bit bus interface latch

No Preview Available !

Philips Semiconductors
8-bit bus interface latch with set and reset
(3-State)
Product specification
74ABT845
LOGIC SYMBOL (IEEE/IEC)
LOGIC SYMBOL
1&
2
EN
23
14
S2
11
R
13
C1
3
1D 2
4
5
6
7
8
9
10
22
21
20
19
18
17
16
15
SA00260
3 4 5 6 7 8 9 10
D0 D1 D2 D3 D4 D5 D6 D7
13 LE
14 PRE
11 MR
1 OE0
2 OE1
23 OE2
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
22 21 20 19 18 17 16 15
SA00259
FUNCTION TABLE
INPUTS
OUTPU
TS
OPERATING
MODE
OE PR
nE
MR
LE
Dn
Qn
LLXXX
H Preset
LH L XX
L Clear
LHHH L
LHH HH
L
H
Transparent
LHH
l
LHH h
L
H
Latched
HX X X X
Z High impedance
LHH L X
NC Hold
LOGIC DIAGRAM
H=
h=
L=
l=
NC=
X=
Z=
=
High voltage level
High voltage level one set-up time prior to the High-to-Low LE
transition
Low voltage level
Low voltage level one set-up time prior to the High-to-Low LE
transition
No change
Don’t care
High impedance “off” state
High-to-Low transition
14
PRE
11
MR
D0 D1 D2 D3 D4 D5 D6 D7
3 4 5 6 7 8 9 10
P
D
LQ
C
P
D
LQ
C
P
D
LQ
C
P
D
LQ
C
P
D
LQ
C
P
D
LQ
C
P
D
LQ
C
P
D
LQ
C
LE
OE0
OE1
OE2
13
1
2
23
22 21 20 19 18 17
16 15
Q0 Q1 Q2 Q3 Q4
Q5 Q6 Q7
SA00261
1995 Sep 06
2


Part Number 74ABT845
Description 8-bit bus interface latch
Maker NXP
Total Page 7 Pages
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