DM74AS873 FAIRCHILD | Alldatasheet

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Features

I Switching specifications at 50 pF I Switching specifications guaranteed over full tempera- ture and VCC range I Advanced oxide-isolated, ion-implanted Schottky TTL process I 3-STATE buffer-type outputs drive bus lines directly I Space Saving 300 Mil Wide Package I Bus structured pinout Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Order Number Package Number Package Description DM74AS873NT N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

www.fairchildsemi.com 2 DM74AS873 Function Table L = LOW State H = HIGH State X = Don’t Care Z = High Impedance State Q 0 = Previous Condition of Q Logic Diagram Inputs Output CLR DE N O C Q XXXHZ LXXLL HHHLH HLHLL HXLL Q 0

3 www.fairchildsemi.com DM74AS873 Absolute Maximum Ratings(Note 1) Note 1: 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 tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Recommended Operating Conditions Note 2: The (↓) arrow indicates the negative edge of the enable is used for reference.

Electrical Characteristics

over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Note 3: The output conditions have been chosen to produce a current that closely approximates one half of the true short circuit current, IOS . Supply Voltage 7V Input Voltage 7V Voltage Applied to Disabled Output 5.5V Operating Free Air Temperature Range 0 °C to +70°C Storage Temperature Range −65°C to +150°C Typical θJA N Package 47.0 °C/W Symbol Parameter Min Nom Max Units VCC Supply Voltage 4.5 5 5.5 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −15 mA IOL LOW Level Output Current 48 mA tW Pulse Width Enable HIGH 5.5 ns Clear LOW 3.5 tSU Data Setup Time (Note 2) 2 ↓ ns tH Data Hold Time (Note 2) 3 ↓ ns TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units VIK Input Clamp Voltage V CC = 4.5V, II = −18 mA −1.2 V VOH HIGH Level V CC = 4.5V, VIL = Max 2.4 3.3 V Output Voltage I OH = Max IOH = −2 mA, VCC = 4.5V to 5.5V V CC −2V VOL LOW Level V CC = 4.5V, VIH = 2V 0.35 0.5 V Output Voltage I OL = Max II Input Current at Max V CC = 5.5V, VIH = 7V 0.1 mA Input Voltage IIH HIGH Level Input Current V CC = 5.5V, VIH = 2.7V 20 µA IIL LOW Level Input Current V CC = 5.5V, VIL = 0.4V −0.5 mA IO (Note 3) Output Drive Current V CC = 5.5V, VO = 2.25V −30 −112 mA IOZH OFF-State Output Current, V CC = 5.5V, VIH = 2V 50 µA HIGH Level Voltage Applied V O = 2.7V IOZL OFF-State Output Current, V CC = 5.5V, VIH = 2V −50 µA LOW Level Voltage Applied V O = 0.4V ICC Supply Current V CC = 5.5V Outputs HIGH 68 110 mA Outputs Open Outputs LOW 67 109 mA Outputs Disabled 80 129 mA

www.fairchildsemi.com 4 DM74AS873 Switching Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Symbol Parameter Conditions From To Min Max Units tPLH Propagation Delay Time V CC = 4.5V to 5.5V Data Any Q 3 6.5 ns LOW-to-HIGH Level Output R L = 500Ω tPHL Propagation Delay Time C L = 50 pF Data Any Q 3 6 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Enable Any Q 6 11.5 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Enable Any Q 4 7.5 ns HIGH-to-LOW Level Output tPZH Output Enable Time Output Control Any Q 2 6.5 ns to HIGH Level Output tPZL Output Enable Time Output Control Any Q 4 9.5 ns to LOW Level Output tPHZ Output Disable Time Output Control Any Q 2 6.5 ns from HIGH Level Output tPLZ Output Disable Time Output Control Any Q 2 7.5 ns from LOW Level Output tPHL Propagation Delay Time Clear Any Q 3 8.5 ns HIGH-to-LOW Level Output

5 www.fairchildsemi.com DM74AS873 Dual 4-Bit D-Type Transparent Latches with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N24C Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD ’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 FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com