Aeroflex UTMC UT54ACTS245, UT54ACS245 Datasheet
165 RadHard MSI Logic
UT54ACS245/UT54ACTS245
Radiation-Hardened
Octal Bus Transceiver with Three-State Outputs
FEATURES
Three-state outputs drive bus line directly
radiation-hardened CMOS
- Latchup immune
High speed
Low power consumption
Single 5 volt supply
Available QML Q or V processes
Flexible package
- 20-pin DIP
- 20-lead flatpack
DESCRIPTION
The UT54ACS245 and the UT54ACTS245 are non-inverting
octal bus transceivers designed for asynchronous two-way communication between data buses. The control function implementation minimizes external timing requirements.
The devices allow data transmission from the A bus to the B bus
or from the B bus to the A bus depending upon the logic level
at the direction control (DIR) input. The enable input (G) disables the device so that the buses are effectively isolated.
The devices are characterized over full military temperature
range of -55 C to +125 C.
FUNCTION TABLE
PINOUTS
20-Pin DIP
Top View
20-Lead Flatpack
Top View
LOGIC SYMBOL
ENABLEGDIRECTION
CONTROL DIR OPERATION
L L B Data To A Bus
L H A Data To B Bus
H X Isolation
1
2
3
4
5
7
6
20
19
18
17
16
14
15
DIR
A1
A2
A3
A4
A5
A6
V
DD
G
B1
B2
B3
B5
8
13
A7
B6
B4
9
12
A8 B7
10
11
V
SS
B8
1
2
3
4
5
7
6
20
19
18
17
16
14
15
DIR
A1
A2
A3
A4
A5
A6
V
DD
G
B1
B2
B3
B5
8
13
A7
B6
B4
9
12
A8
B7
10
11
V
SS
B8
(19)
G G3
(2)
A1
(3)
A2
(4)
(18)
B1
(16)
(17)
B2
Note:
1. Logic symbol in accordance with ANSI/IEEE Std 91-1984 and IEC
Publication 617-12.
A3
(5)
A4
(6)
A5
(7)
A6
B3
(13)
B6
(14)
B5
(15)
B4
(8)
A7
(9)
A8
(11)
B8
(12)
B7
(1)
DIR 3 EN1 (BA)
3 EN2 (AB)
1
2
RadHard MSI Logic 166
UT54ACS245/UT54ACTS245
LOGIC DIAGRAM
A1
A2
A3
A4
A5
A6
A7
A8
DIR
(1)
(2)
(19)
(18)
(3)
(17)
(4)
(16)
(5)
(15)
(6)
(14)
(7)
(13)
(8)
(12)
(9)
(11)
B1
B2
B3
B6
B5
B4
B8
B7
G
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