UT54ACS264/UT54ACTS264 Radiation-Hardened Look-Ahead Carry Generators for Counters FEATURES PINOUTS 16-Pin DIP Top View Performs look-ahead carry across n-bit counters Accommodates active-high or active-low carry Improves cascaded counters system performance radiation-hardened 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 A1 1 16 VDD B1 2 15 B2 A0 3 14 A2 B0 4 CE A3 5 13 12 B3 RCOB 6 7 11 10 C1 RCOA VSS 8 9 C0 C2 DESCRIPTION The UT54ACS264 and the UT54ACTS264 are look-ahead generators designed specifically to perform a carry-anticipate across any number of n-bit counters, thus increasing system clock frequency. 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-carry 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. 16-Lead Flatpack Top View A1 1 16 VDD B1 2 15 B2 A0 3 14 A2 B0 4 13 CE A3 5 12 C0 B3 6 11 C1 RCOB VSS 7 8 10 9 RCOA C2 The devices are characterized over full military temperature range of -55 C to +125 C. 183 RadHard MSI Logic UT54ACS264/UT54ACTS264 LOGIC SYMBOL ACTIVE-LOW INPUTS ACTIVE-HIGH INPUTS CE B0 A0 B1 A1 B2 A2 B3 A3 (13) 1,3 2,3 1 1,3,5 2,3,5 4,5 1 1,3,5,7 2,3,5,7 4,5,7 6,7 1 Z1 (4) Z2 (3) G3 (12) CE C1 A0 B1 (2) Z4 (1) G5 (15) Z6 (14) G7 (6) (9) C2 1,3,5,7, 4,5,7,9 6,7,9 8,9 1 2 4 6 8 1 A2 (10) RCOA Z8 (5) A1 B2 1 B3 A3 G9 (7) Z1 1,2 3 1 G2 5 3,4 1,2,4 1 7 5,6 3,4,6 1,2,4,6 1 C0 B0 (11) (13) (4) (3) Z3 (2) G4 (1) Z5 (15) (6) G8 (5) A0 B0 CE C0 H H X H H X H H L X X X L L L L FUNCTION TABLE FOR C1 OUTPUT 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 X L L X X L X L (7) RCOB FUNCTION TABLE FOR C2 OUTPUT 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 L X X X X X X 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 FUNCTION TABLE FOR RCOB OUTPUT 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 L L L L L L RadHard MSI Logic RCOA RCOB A3 L INPUTS C2 FUNCTION TABLE FOR RCOA OUTPUT L L C1 Z9 FUNCTION TABLE FOR C0 OUTPUT OUTPUT (10) 1,2,4,6,8 Notes: 1. Logic symbols in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. INPUTS C0 1 9 7,8 5,6,8 3,4,6,8 1,4,6,8 Z7 (11) (9) G6 (14) (12) A2 A1 A0 B3 H X X X H H X X H H H H H L X X L X X X OUTPUT B2 B1 CE RCOA H X X X H X H X X H X X X H X H H H X X X H H X X X X X X L X X L X X X L X L X L L X X L X X L L L L X L X X X L L L L L 184 UT54ACS264/UT54ACTS264 LOGIC DIAGRAM (7) RCOB (13) CE (10) RCOA B3 A3 (6) (5) (9) C2 B2 A2 (15) (14) (11) C1 B1 A1 (2) (1) (12) B0 A0 185 (4) C0 (3) RadHard MSI Logic UT54ACS264/UT54ACTS264 RADIATION HARDNESS SPECIFICATIONS 1 PARAMETER LIMIT UNITS Total Dose 1.0E6 rads(Si) SEU Threshold 2 80 MeV-cm2/mg SEL Threshold 120 MeV-cm2/mg Neutron Fluence 1.0E14 n/cm2 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 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 TJ Maximum junction temperature +175 C TLS Lead temperature (soldering 5 seconds) +300 C Thermal resistance junction to case 20 C/W II DC input current 10 mA PD Maximum power dissipation 1 W JC 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 SYMBOL PARAMETER LIMIT UNITS VDD Supply voltage 4.5 to 5.5 V VIN Input voltage any pin 0 to VDD V TC Temperature range -55 to + 125 C RadHard MSI Logic 186 UT54ACS264/UT54ACTS264 DC ELECTRICAL CHARACTERISTICS 7 (VDD = 5.0V 10%; V SS = 0V 6, -55 C < TC < +125 C) SYMBOL VIL VIH IIN PARAMETER CONDITION MIN Low-level input voltage 1 ACTS ACS High-level input voltage 1 ACTS ACS MAX UNIT 0.8 .3VDD V .5VDD .7VDD V Input leakage current ACTS/ACS VIN = VDD or VSS Low-level output voltage 3 ACTS ACS IOL = 8mA IOL = 100 A High-level output voltage 3 ACTS ACS IOH = -8mA IOH = -100 A Short-circuit output current 2 ,4 ACTS/ACS VO = VDD and VSS -200 Output current10 VIN = VDD or VSS 8 mA (Sink) VOL = 0.4V Output current10 VIN = VDD or VSS -8 mA (Source) VOH = VDD - 0.4V Ptotal Power dissipation 2, 8, 9 CL = 50pF 2.2 mW/ MHz IDDQ Quiescent Supply Current VDD = 5.5V 10 A Quiescent Supply Current Delta For input under test 1.6 mA VOL VOH IOS IOL IOH IDDQ ACTS -1 1 A 0.40 0.25 V .7VDD VDD - 0.25 V 200 mA VIN = VDD - 2.1V For all other inputs VIN = VDD or VSS VDD = 5.5V CIN COUT 187 Input capacitance 5 = 1MHz @ 0V 15 pF Output capacitance 5 = 1MHz @ 0V 15 pF RadHard MSI Logic UT54ACS264/UT54ACTS264 Notes: 1. Functional tests are conducted in accordance with MIL-STD-883 with the following input test conditions: V IH = 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-38535, for current density 5.0E5 amps/cm2, the maximum product of load capacitance (per output buffer) 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. AC ELECTRICAL CHARACTERISTICS 2 (VDD = 5.0V 10%; V SS = 0V 1, -55 C < TC < +125 C) 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 Notes: 1. Maximum allowable relative shift equals 50mV. 2. All specifications valid for radiation dose 1E6 rads(Si). RadHard MSI Logic 188