1
Standard Products
UT54ACS264/UT54ACTS264
Look-Ahead Carry Generators for Counters
Datasheet
November 2010
www.aeroflex.com/logic
FEATURES
Performs look-ahead carry across n-bit counters
Accommodates active-high or active-low carry
Improves cascaded counters system performance
1.2μ CMOS
- Latchup immune
High speed
Low power consumption
Single 5 volt supply
Available QML Q or V processes
Flexible package
- 16-pin DIP
- 16-lead flatpack
UT54ACS264- SMD 5962-96576
UT54ACTS264 - SMD 5962-96577
DESCRIPTION
The UT54ACS264 and the UT54ACTS264 are look-ahead gen-
erators designed specifically to perform a carry-anticipate across
any number of n-bit counters, thus increasing system clock fre-
quency. A carry enable CE, and carry outputs RCOA and RCOB
are provided for n-bit cascading.
Use the counter with either active-high-carry or active-low-car-
ry counters. For active-high-carry counters, CE is active high,
the A set of inputs and output RCOA are used. The B set of
inputs are connected to a low logic level. For active-low-carry
counters, CE is active low , the B set of inputs and output RCOB
are used. The A set of inputs are connected to a high logic level.
The devices are characterized over full military temperature
range of -55°C to +125°C.
PINOUTS 16-Pin DIP
Top View
16-Lead Flatpa ck
Top View
1
2
3
4
5
7
6
16
15
14
13
12
10
11
A1
B1
A0
B0
A3
B3
RCOB
VDD
B2
A2
CE
C0
C1
RCOA
8 9
VSS C2
1
2
3
4
5
7
6
16
15
14
13
12
10
11
VDD
A1
B1
A0
B0
A3
B3
RCOB
B2
A2
CE
C0
C1
RCOA
VSS C2
89
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LOGIC SYMBOL
Notes:
1. Logic symbols in accord ance with ANSI/IEEE Std 91-1984 and IEC
Publication 617-12.
FUNCTION TABLE FOR C0 OUTPUT
FUNCTION TABLE FOR C1 OUTPUT
FUNCTION TABLE FOR RCOB OUTPUT
FUNCTION TABLE FOR C2 OUTPUT
FUNCTION TABLE FOR RCOA OUTPUT
(12) C0
(11) C1
(9) C2
(10) RCOA
(7) RCOB
≥1
≥1
≥1
≥1
≥1
1,3
2,3
1,3,5
2,3,5
4,5
1,3,5,7
2,3,5,7
4,5,7
6,7
1,3,5,7,
4,5,7,9
6,7,9
8,9
1
2
4
6
8
(13)
CE
(4)
B0
(3)
A0
(2)
B1
(1)
A1
(15)
B2
(14)
A2
(6)
B3
(5)
A3 G9
Z8
G7
Z6
G5
Z4
G3
Z2
Z1
ACTIVE-HIGH INPUTS
(12) C0
(11) C1
(9) C2
(10) RCOA
(7) RCOB
≥1
≥1
≥1
≥1
1,2
3
5
3,4
1,2,4
7
5,6
3,4,6
1,2,4,6
9
7,8
5,6,8
3,4,6,8
1,2,4,6,8
(13)
CE
(4)
B0
(3)
A0
(2)
B1
(1)
A1
(15)
B2
(14)
A2
(6)
B3
(5)
A3 Z9
G8
Z7
G6
Z5
G4
Z3
G2
Z1
ACTIVE-LOW INPUTS
1,4,6,8
INPUTS OUTPUT
A0 B0 CE C0
H H X H
H X H H
L X X L
X L L L
INPUTS OUTPUT
A1 A0 B1 B0 CE C1
H X H X X H
H H X H X H
H H X X H H
L X X X X L
X L L X X L
X X L L L L
INPUTS OUTPUT
B3 B2 B1 B0 CE RCOB
H X X X X H
X H X X X H
X X H X X H
X X X H X H
X X X X H H
LLLLL L
INPUTS OUTPUT
A2 A1 A0 B2 B1 B0 CE C2
H X X H X X X H
H H X X H X X H
H H H X X H X H
H H H X X X H H
LXXXXXX L
X L X L X X X L
X X L L L X X L
X X X L L L L L
INPUTS OUTPUT
A3 A2 A1 A0 B3 B2 B1 CE RCOA
H X X X H X X X H
H H X X X H X X H
H H H X X X H X H
H H H H X X X H H
L X X X X X X X L
X L X X L X X X L
X X L X L L X X L
X X X L L L L X L
X X X X L L L L L
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LOGIC DIAGRAM
(10) RCOA
RCOB
(7)
(9) C2
(11) C1
(12) C0
(13)
(6)
(5)
(15)
(14)
(2)
(1)
(4)
(3)
CE
B3
A3
A2
B1
A1
B0
A0
B2
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OPERATIONAL ENVIRONMENT1
Notes:
1. Logic will not latchup during radiation exposure within the limits defined in the table.
2. Device storage elements are immune to SEU affects.
ABSOLUTE MAXIMUM RATINGS
Note:
1. Stresses outside the listed absolute maximum ratings may cause permanent damage to the device. This is a stress rating only, functional operation of the device at
these or any other conditions beyond limits indicated in the operational sections is not recommended. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
PARAMETER LIMIT UNITS
Total Dose 1.0E6 rads(Si)
SEU Threshold 280 MeV-cm2/mg
SEL Threshold 120 MeV-cm2/mg
Neutron Fluence 1.0E14 n/cm2
SYMBOL PARAMETER LIMIT UNITS
VDD Supply voltage -0.3 to 7.0 V
VI/O Voltage any pin -.3 to VDD +.3 V
TSTG Storage Temperature range -65 to +150 °C
TJMaximum junction temperature +175 °C
TLS Lead temperature (soldering 5 seconds) +300 °C
ΘJC Thermal resistance junction to case 20 °C/W
IIDC input current ±10 mA
PDMaximum power dissipation 1 W
SYMBOL PARAMETER LIMIT UNITS
VDD Supply voltage 4.5 to 5.5 V
VIN Input voltage any pin 0 to VDD V
TCTemperature range -55 to + 125 °C
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DC ELECTRICAL CHARACTERISTICS 7
(VDD = 5.0V ±10%; VSS = 0V 6, -5 5 °C < TC < +125°C); Unless otherw ise noted, Tc is per the temperature range ordered.
SYMBOL PARAMETER CONDITION MIN MAX UNIT
VIL Low-level input vo ltage 1
ACTS
ACS 0.8
.3VDD
V
VIH High-level input voltage 1
ACTS
ACS .5VDD
.7VDD
V
IIN Input leakage current
ACTS/ACS VIN = VDD or VSS -1 1μA
VOL Low-level output voltage 3
ACTS
ACS IOL = 8.0mA
IOL = 100μA0.40
0.25 V
VOH High-level output voltage 3
ACTS
ACS IOH = -8.0mA
IOH = -100μA.7VDD
VDD - 0.25 V
IOS Short-circuit output current 2 ,4
ACTS/ACS VO = VDD and VSS -200 200 mA
IOL Output current10
(Sink)
VIN = VDD or VSS
VOL = 0.4V
8mA
IOH Output current10
(Source)
VIN = VDD or VSS
VOH = VDD - 0.4V
-8 mA
Ptotal Power dissipatio n 2, 8, 9 CL = 50pF 2.1 mW/
MHz
IDDQ Quiescent Supply Cur rent VDD = 5.5V 10 μA
ΔIDDQ Quiescent Supply Current Delta
ACTS For input under test
VIN = VDD - 2.1V
For all other inputs
VIN = VDD or VSS
VDD = 5.5V
1.6 mA
CIN Input capacitance 5ƒ = 1MHz @ 0V 15 pF
COUT Output capacitance 5 ƒ = 1MHz @ 0V 15 pF
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Notes:
1. Functional tests are conducted in accordance with MIL-STD-883 with the following input test conditions: VIH = VIH(min) + 20%, - 0%; VIL = VIL(max) + 0%, -
50%, as specified herein, for TTL, CMOS, or Schmitt compatible inputs. Devices may be tested using any input voltage within the above specified range, but are
guaranteed to VIH(min) and VIL(max).
2. Supplied as a design limit but not guaranteed or tested.
3. Per MIL-PRF-3853 5, for current density ≤ 5.0E5 amps/cm 2, the maximum product of load capacitance (per output buf fer) times frequency should not exceed 3,765
pF/MHz.
4. Not more than one output may be shorted at a time for maximum duration of one second.
5. Capacitance measured for initial qualification and when design changes may affect the value. Capacitance is measured between the designated terminal and VSS at
frequency of 1MHz and a signal amplitude of 50mV rms maximum.
6. Maximum allowable relative shift equals 50mV.
7. All specifications valid for radiation dose ≤ 1E6 rads(Si).
8. Power does not include power contribution of any TTL output sink current.
9. Power dissipation specified per switching output.
10. This value is guaranteed based on characterization data, but not tested.
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AC ELECTRICAL CHARACTERISTICS 2
(VDD = 5.0V ±10%; VSS = 0V 1, -55°C < TC < +125°C); Unless otherwise noted, Tc is per the temperature range ordered.
Notes:
1. Maximum allowable relative shift equals 50mV.
2. All specifications valid for radiation dose ≤ 1E6 rads(Si).
SYMBOL PARAMETER MINIMUM MAXIMUM UNIT
tPLH CE to C0, C1, C2 1 17 ns
tPHL CE to C0, C1, C2 1 16 ns
tPLH An or Bn to C0, C1, C2 1 15 ns
tPHL An or Bn to C0, C1, C2 1 17 ns
tPLH An, Bn or CE to RCOA 1 15 ns
tPHL An, Bn or CE to RCOA 1 15 ns
tPLH Bn or CE to RCOB 1 12 ns
tPHL Bn or CE to RCOB 1 15 ns
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PACKAGING Side-Brazed Packages
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FLATPACK PACKAGES
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UT54ACS264/U T54ACTS264: SMD
5962 ***** ** * * **
Lead Finish: (Notes 1 & 2)
A = Solder
C = Gold
X = Optional
Package Type:
X = 16-lead ceramic bottom-brazed dual-in-line Flatpack
C = 16-lead ceramic side-brazed dip
Class Designator:
Q = QML Class Q
V = QML Class V
Device Type:
01
Drawing Number:
96576 = UT54ACS264
96577 = UT54AC TS264
Total Dose: (Notes 3 & 4)
R = 1E5 rads(Si)
F = 3E5 rads(Si)
G = 5E5 rads(Si)
H = 1E6 rads(Si)
Notes:
1. Lead finish (A,C, or X) must be specif i ed.
2. If an “X” is specified when ordering, part marking will match the lead finish and will be either “A” (solder) or “C” (gold).
3. Total dose radiation must be specified when o rdering. QML Q and QML V not available without radiation hardening. For prototype inquiries, contact factory.
4. Device type 02 is only offer ed with a TID toler ance guarantee of 3E5 rads(Si) or 1E6 rads(Si) and is tested in accordance with MIL-STD-883 Test Method 1019
Condition A and section 3.11.2. Device type 03 is only offered with a TID tolerance guarantee of 1E5 rads(Si), 3E5 rads(Si), and 5E5 rads(Si), and is tested in
accordance with MIL-STD-8 83 Test Method 1019 Condition A.
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Datasheet - Shipping QML & Reduced Hi-Rel
