DM7556

DM7556 NSC | Alldatasheet

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Y Typical clock frequency 35 MHz Y TRI-STATE outputs Y Fully independent clear Y Synchronous loading Y 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/O A I/OB I/OC I/OD QA QB QC QD HX X LH L L L LLLL L HX X HH Z Z Z ZLLL L HX L L L Q A0 QB0 QC0 QD0 QA0 QB0 QC0 QD0 HX L HL Z Z Z Z Q A0 QB0 QC0 QD0 LH u LL abcd A B C D HL u L L COUNT COUNT HL u H L Z Z Z Z COUNT 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,Q B0,Q C0,Q D0 e The level of Q A,Q B,Q C,Q D 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 RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings (Note) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Input Voltage 5.5V Operating Free Air Temperature Range DM75 b55§Ct o a125§C DM85 0 §Ct o a70§C Storage Temperature Range b65§Ct o a150§C Note: The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaran- teed. 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. Recommended Operating Conditions Symbol Parameter DM7556 DM8556 Units Min Nom Max Min Nom Max VCC Supply Voltage 4.5 5 5.5 4.75 5 5.25 V VIH High Level Input Voltage 2 2 V VIL Low Level Input Voltage 0.8 0.8 V IOH High Level Output Current b2 b5.2 mA IOL Low Level Output Current 16 16 mA fCLK Clock Frequency (Note 1) 0 25 0 25 MHz tW Pulse Width Clock 25 25 (Note 1) Clear 20 20 ns Load 30 30 tCE Count Enable Setup 30 30 nsTime (Note 1) Hold b10 b10 tSETUP(1) Setup Time High Data 25 25 nsLogic Level (Note 1) Load 30 30 tHOLD(1) Hold Time High Data 5 5 nsLogic Level (Note 1) Load b10 b10 tSETUP(0) Setup Time Low Data 30 30 nsLogic Level (Note 1) Load 25 25 tHOLD(0) Hold Time Low Data 5 5 nsLogic Level (Note 1) Load b10 b10 TA Free Air Operating Temperature b55 125 0 70 §C Note 1: TA e 25§C and V CC e 5V.

Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Units(Note 1) VI Input Clamp Voltage V CC e Min, I I eb 12 mA b1.5 V VOH High Level Output V CC e Min, I OH e Max 2.4 VVoltage V IL e Max, V IH e Min VOL Low Level Output V CC e Min, I OL e Max 0.4 VVoltage V IH e Min, V IL e Max II Input Current @ Max V CC e Max, V I e 5.5V 1m AInput Voltage IIH High Level Input Current V CC e Max, V I e 2.4V 40 mA IIL Low Level Input Current V CC e Max, V I e 0.4V b1.6 mA IOZH Off-State Output Current with V CC e Max, V O e 2.4V High Level Output V IH e Min, V IL e Max 40 mA Voltage Applied IOZL Off-State Output Current with V CC e Max, V O e 0.4V Low Level Output V IH e Min, V IL e Max b40 mA Voltage Applied IOS Short Circuit V CC e Max DM75 b25 b70 mAOutput Current (Note 2) DM85 b25 b70 ICC Supply Current V CC e Max 75 100 mA Note 1: All typicals are at V CC e 5V, T A e 25§C. Note 2: Not more than one output should be shorted at a time. Switching Characteristics at V CC e 5V and T A e 25§C (See Section 1 for Test Waveforms and Output Load) From (Input) RL e 400X Symbol Parameter To (Output) CL e 5p F C L e 50 pF Units Min Max Min Max fMAX Maximum Clock Frequency 25 MHz tPLH Propagation Delay Time Clock to 22 nsLow to High Level Output Output tPHL Propagation Delay Time Clock to 44 nsHigh to Low Level Output Output tPLH Propagation Delay Time Clock to 33 nsLow to High Level Output MAX-CNT tPHL Propagation Delay Time Clock to 33 nsHigh to Low Level Output MAX-CNT tPHL Propagation Delay Time Reset to 44 nsHigh to Low Level Output Output tPZH Output Enable Time Output 20 nsto High Level Output Disable to Q tPZL Output Enable Time Output 20 nsto Low Level Output Disable to Q tPHZ Output Disable Time Output 12 nsfrom High Level Output Disable to Q tPLZ Output Disable Time Output 20 nsfrom Low Level Output Disable to Q

TL/F/6588–2

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.

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

Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number DM7556J

DM7556/DM8556 TRI-STATE Programmable Binary Counters Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number DM8556N 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. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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