UT54ACS162245SLV
RadHard Schmitt CMOS 16-bit Bidirectional MultiPurpose
Low Voltage Transceiver
Datasheet
January 2008
FEATURES
• Voltage translation
- 3.3V bus to 2.5V bus
- 2.5V bus to 3.3V bus
• Cold sparing all pins
• 0.25μ Commercial RadHardTM CMOS
- Total dose: 300Krad(Si) and 1Mrad(Si)
- Single Event Latchup immune
• High speed, low power consumption
• Schmitt trigger inputs to filter noisy signals
• Cold and Warm Spare - all outputs
• Available QML Q or V processes
• Standard Microcircuit Drawing 5962-02543
• Package:
- 48-lead flatpack, 25 mil pitch (.390 x .640), wgt 1.4 Grams
DESCRIPTION
The 16-bit wide UT54ACS162245SLV MultiPurpose low volt-
age transceiver is built using Aeroflex UTMC’s Commercial
RadHardTM epitaxial CMOS technology and is ideal for space
applications. This high speed, low power
UT54ACS162245SLV low voltage transceiver is design ed to
perform multiple functions including: asy nchrono us two-way
communication, Schmitt input buffering, voltage translation,
warm and cold sparing. With VDD equal to zero volts, the
UT54ACS162245SLV outputs and input s present a minimum
impedance of 1MΩ making it ideal for "cold spare" applications.
Balanced outputs and low "on" outpu t impe dance mak e the
UT54ACS162245SLV well suited for driving high capacitance
loads and low impedance backplanes. The
UT54ACS162245SL V enables system designers to interface 2.5
volt CMOS compatible components with 3.3 volt CMOS com-
ponents. For voltage translation, the A port interfaces with the
2.5 volt bus; the B port interfaces with the 3.3 volt bus. The
direction control (DIRx) controls the direction of data flow. The
output enable (OEx) overrides the direction control and disables
both ports. These signals can be driven from either port A or B.
The direction and output enable controls operate these devices
as either two independent 8-bit transceivers or one 16-bit trans-
ceiver.
LOGIC SYMBOL
PIN DESCRIPTION
Pin Names Description
OEx Output Enable Input (Active Low)
DIRx Direction Control Inputs
xAx Side A Inputs or 3-State Outputs (2.5V Port)
xBx Side B Inputs or 3-State Outputs (3.3V Port)
(48)
OE1
G2
(47)
1A1
(46)
1A2 (44)
(2) 1B1
(5)
(3) 1B2
1A3 (43)
1A4 (41)
1A5 (40)
1A6
1B3
(9) 1B6
(8) 1B5
(6) 1B4
(38)
1A7 (37)
1A8 (12) 1B8
(11) 1B7
(1)
DIR1 1EN1 (BA)
1EN2 (AB)
11 12
(25)
OE2G1 (24) DIR2
21 22
(36)
2A1 2B1
(13)
(35)
2A2 (33)
2A3 (32)
2A4 (30)
2A5 (29)
2A6 (27)
2A7 (26)
2A8
(16) 2B2
2B3
(20) 2B6
(19) 2B5
(17) 2B4
(23) 2B8
(22) 2B7
(14)
2EN1 (BA)
2EN2 (AB)