UT54ACS245/UT54ACTS245
Radiation-Hardened
Octal Bus Transceiver with Three-State Outputs
FEATURES
PINOUTS
20-Pin DIP
Top View
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
1
2
3
VDD
G
20
19
18
17
16
DIR
A1
B1
B2
B3
A2
A3
A4
4
5
15
14
6
7
B4
B5
B6
B7
A5
A6
A7
A8
- 20-lead flatpack
13
12
8
9
DESCRIPTION
11
10
VSS
B8
The UT54ACS245 and the UT54ACTS245 are non-inverting
octal bus transceivers designed for asynchronous two-way com-
munication between data buses. The control function imple-
mentation minimizes external timing requirements.
20-Lead Flatpack
Top View
DIR
1
VDD
20
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) dis-
ables the device so that the buses are effectively isolated.
A1
A2
A3
A4
A5
A6
2
3
4
5
19
18
17
16
15
14
13
12
11
G
B1
B2
B3
The devices are characterized over full military temperature
range of -55 C to +125 C.
6
B4
B5
B6
B7
B8
7
8
A7
A8
FUNCTION TABLE
9
ENABLE
G
DIRECTION
CONTROL DIR
10
VSS
OPERATION
B Data To A Bus
A Data To B Bus
Isolation
L
L
L
H
X
LOGIC SYMBOL
H
(19)
G
G3
(1)
DIR
3 EN1 (BA)
3 EN2 (AB)
(18)
(2)
A1
1
B1
2
(3)
A2
(17)
(16)
(15)
B2
B3
B4
B5
(4)
A3
(5)
A4
(6)
(14)
(13)
(12)
(11)
A5
(7)
A6
B6
B7
(8)
A7
(9)
A8
B8
Note:
1. Logic symbol in accordance with ANSI/IEEE Std 91-1984 and IEC
Publication 617-12.
165
RadHard MSI Logic