DP8483 TTL to 100k ECL Level Translator with Latch General Description Features This circuit translates TTL input levels to ECL output levels and provides a fall-through latch. The outputs are gated with CS providing for wire ORing of outputs. The strobe and chip select inputs operate at ECL levels. Y Y Y Y Y Logic and Connection Diagram 16-pin DIP or S.O. ECL control inputs CS provided for wire ORing of output bus 100k ECL I/O compatible 3.0 ns typical propagation delay Truth Table Dual-In-Line Package D Q STR CS H L X X L H Q L L L H X H H H L H e high level (most positive) L e low level (most negative) X e don’t care Order Number DP8483J, DP8483M or DP8483N See NS Package Number J16A, M16B or N16A TL/F/5864 – 1 Top View C1995 National Semiconductor Corporation TL/F/5864 RRD-B30M105/Printed in U. S. A. DP8483 TTL to 100k ECL Level Translator with Latch April 1990 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Maximum Power Dissipation* at 25§ C Molded Package Storage Temperature VEE Supply Voltage b 8V *Derate molded package 11.8 mW/§ C above 25§ C. VCC Supply Voltage Input Voltage (ECL) Input Voltage (TTL) Output Current 7V GND to VEE b 1V to 5.5V 50 mA 1476 mW b 65§ C to a 150§ C Recommended Operating Conditions VEE Supply Voltage VCC Supply Voltage TA, Ambient Temperature b 4.5V a 7% 5.0V g 10% 0§ C to 85§ C Electrical Characteristics (TTL Logic) (Notes 2 and 3) Symbol Parameter VIL Input Low Voltage VIH Input High Voltage Conditions Min Typ Max Units 0.8 V 2.0 IIL Input Low Current VIN e 0.5V IIH Input High Current VIN e 2.5V VCLAMP Input Clamp Voltage IIN eb12 mA ICC Supply Current VCC e 5.5V V b 25 b 200 mA 1.0 40 mA b 0.9 b 1.2 V 10 20 mA Electrical Characteristics (ECL Logic) (Notes 2 and 3) Conditions Min Max Units VIL Symbol Input Low Voltage Parameter VEE eb4.5V b 1810 Typ b 1475 mV VIH Input High Voltage VEE eb4.5V b 1165 b 880 mV IIL Input Low Current VIN eb1.8V 45 150 mA IIH Input High Current VIN eb0.8V 75 200 mA VOL Output Low Voltage VEE eb4.5V b 1810 b 1705 b 1620 mV VOH Output High Voltage VEE eb4.5V b 1025 b 955 b 880 mV VOLC Output Low Voltage VEE eb4.5V b 1610 mV VOHC Output High Voltage VEE eb4.5V IEE Supply Current VEE eb4.8V b 85 mA b 1035 mV b 65 Switching Characteristics (Notes 2 and 4) Min Typ Max Units tPD1 Symbol Strobe To Output Delay Parameter Conditions 1.5 3.0 6.0 ns tPD2 Data To Output Delay 2.5 4.5 7.5 tS Data Set-Up Time to Strobe 5.0 2.0 tH Data Hold Time 1.0 0 ns tPW Strobe Pulse Width 5.0 3.0 ns tPD3 Chip Select to Output Delay 1.0 2.5 tSCS Data Set-Up Time to Chip Select 5.5 3.0 (Note 4) ns ns 4.0 ns ns Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation. Note 2: Unless otherwise specified, min/max limits apply across the 0§ C to 85§ C ambient temperature range in still air and across the specified supply variations. All typical values are for 25§ C and nominal supply. Note 3: All currents into device pins are shown as positive; all currents out of device pins are shown as negative. All voltages are referenced to ground, unless otherwise specified. Note 4: Unless otherwise specified, all AC measurements are referenced from the 1.5V level of the TTL input and to/from the 50% point of the ECL signal and a 50X resistor to b 2V is the load. ECL input rise and fall times are 0.7 ns g 0.1 ns from 20% to 80%. TTL input characteristics is 0V to 3V with tr e tf s 3 ns measured from 10% to 90%. 2 Switching Time Waveforms TL/F/5864 – 2 TL/F/5864 – 3 Physical Dimensions inches (millimeters) Ceramic Flat Package (F) Order Number DP8483F NS Package Number F16B 3 4 Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number DP8483J NS Package Number J16A Molded Dual-In-Line Package (M) Order Number DP8483M NS Package Number M16B 5 DP8483 TTL to 100k ECL Level Translator with Latch Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number DP8483N NS Package Number N16A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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