DM7556/DM8556 TRI-STATEÉ Programmable Binary Counters General Description Features These circuits are synchronous, edge-sensitive, fully-programmable 4-bit counters. The counters feature both conventional totem-pole and TRI-STATE outputs; such that when the outputs are in the high impedance mode, they can be used to enter data from the bus lines. In addition, the clear input operates completely independent of all other inputs. During the programming operation, data is loaded into the flip-flops on the positive-going edge of the clock pulse. To facilitate cascading of these counters, the MAX COUNT output can be tied directly into the count enable input of the next counter. Y Y Y Y Y Typical clock frequency 35 MHz TRI-STATE outputs Fully independent clear Synchronous loading Cascading circuitry provided internally Connection Diagram Dual-In-Line Package TL/F/6588 – 1 Order Number DM7556J or DM8556N See NS Package Number J16A or N16A Function Table Control Inputs I/O Ports Active Outputs LOAD CE CLK OD Reset I/OA I/OB I/OC I/OD QA QB QC QD H H H H L H H X X X X H L L X X L L L H L H L L H H H L L L L L L Z QA0 Z a L L Z Z QB0 QC0 Z Z b c COUNT Z Z L Z QD0 Z d L L QA0 QA0 A L L L L QB0 QC0 QB0 QC0 B C COUNT COUNT L L QD0 QD0 D u u u Z Z The I/O pins are used as inputs when they are TRI-STATED, and the LOAD input is Low. They are outputs and active when LOAD input is High and OD is Low. H e High Level (Steady State) L e Low Level (Steady State) X e Don’t Care including transitions a, b, c, d e The level of the steady state input at inputs A, B, C, D respectively QA0, QB0, QC0, QD0 e The level of QA, QB, QC, QD respectively, before the indicated steady state input conditions were established. TRI-STATEÉ is a registered trademark of the National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/6588 RRD-B30M105/Printed in U. S. A. DM7556/DM8556 TRI-STATE Programmable Binary Counters August 1989 Absolute Maximum Ratings (Note) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Note: The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings. The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation. Supply Voltage 7V Input Voltage 5.5V Operating Free Air Temperature Range b 55§ C to a 125§ C DM75 DM85 0§ C to a 70§ C Storage Temperature Range b 65§ C to a 150§ C Recommended Operating Conditions Symbol DM7556 Parameter DM8556 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage 0.8 0.8 V IOH High Level Output Current b2 b 5.2 mA IOL Low Level Output Current fCLK Clock Frequency (Note 1) 0 tW Pulse Width (Note 1) Clock 25 Clear 20 20 Load 30 30 tCE tSETUP(1) tHOLD(1) tSETUP(0) tHOLD(0) TA Count Enable Time (Note 1) Setup Time High Logic Level (Note 1) Hold Time High Logic Level (Note 1) Setup Time Low Logic Level (Note 1) Hold Time Low Logic Level (Note 1) 2 2 16 25 0 30 30 Hold b 10 b 10 Data 25 25 Load 30 30 Data 5 5 Load b 10 b 10 Data 30 30 Load 25 25 Data 5 5 Load b 10 b 10 Free Air Operating Temperature b 55 2 V 16 mA 25 MHz 25 Setup Note 1: TA e 25§ C and VCC e 5V. V 125 0 ns ns ns ns ns ns 70 §C Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ (Note 1) Max Units b 1.5 V VI Input Clamp Voltage VCC e Min, II e b12 mA VOH High Level Output Voltage VCC e Min, IOH e Max VIL e Max, VIH e Min VOL Low Level Output Voltage VCC e Min, IOL e Max VIH e Min, VIL e Max II Input Current @ Max Input Voltage VCC e Max, VI e 5.5V IIH High Level Input Current VCC e Max, VI e 2.4V 40 mA IIL Low Level Input Current VCC e Max, VI e 0.4V b 1.6 mA IOZH Off-State Output Current with High Level Output Voltage Applied VCC e Max, VO e 2.4V VIH e Min, VIL e Max 40 mA Off-State Output Current with Low Level Output Voltage Applied VCC e Max, VO e 0.4V VIH e Min, VIL e Max b 40 mA Short Circuit Output Current VCC e Max (Note 2) Supply Current VCC e Max IOZL IOS ICC 2.4 V 0.4 V 1 mA DM75 b 25 b 70 DM85 b 25 b 70 75 100 mA mA Note 1: All typicals are at VCC e 5V, TA e 25§ C. Note 2: Not more than one output should be shorted at a time. Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter From (Input) To (Output) RL e 400X CL e 5 pF Min Max CL e 50 pF Min Units Max fMAX Maximum Clock Frequency tPLH Propagation Delay Time Low to High Level Output Clock to Output 25 22 ns tPHL Propagation Delay Time High to Low Level Output Clock to Output 44 ns tPLH Propagation Delay Time Low to High Level Output Clock to MAX-CNT 33 ns tPHL Propagation Delay Time High to Low Level Output Clock to MAX-CNT 33 ns tPHL Propagation Delay Time High to Low Level Output Reset to Output 44 ns tPZH Output Enable Time to High Level Output Output Disable to Q 20 ns tPZL Output Enable Time to Low Level Output Output Disable to Q 20 ns tPHZ Output Disable Time from High Level Output Output Disable to Q 12 ns tPLZ Output Disable Time from Low Level Output Output Disable to Q 20 ns 3 MHz 75/8556 TL/F/6588 – 2 Logic Diagram 4 Timing Diagram 75/8556 Typical Clear, Preset, Count, Inhibit Sequence TL/F/6588 – 3 Sequence (1) Clear to zero. (2) Load binary five. (3) Count six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, zero. (4) Disable TRI-STATE outputs. (5) Disable counter. (6) Count to one. 5 Switching Time Waveforms Clock and Reset Voltage TL/F/6588 – 4 Count Enable and Clock TL/F/6588 – 5 Load, Data and Clock TL/F/6588 – 6 Output Disable TL/F/6588 – 7 6 Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number DM7556J NS Package Number J16A 7 DM7556/DM8556 TRI-STATE Programmable Binary Counters Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number DM8556N 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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