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| DM74ALS137 3 to 8 Line Decoder/Demultiplexer with Address Latches February 1991 Revised February 2000 DM74ALS137 3 to 8 Line Decoder/Demultiplexer with Address Latches General Description The ALS137 is a three line to eight line decoder/demultiplexer with latches on the three address inputs. When the latch-enable input (GL) is LOW, the ALS137 acts as a decoder/demultiplexer. When GL goes from LOW-to-HIGH, the address present at the select inputs (A, B, and C) is stored in the latches. Further address changes are ignored as long as GL remains HIGH. The output enable controls, G1 and G2, control the state of the outputs independently of the select or latch-enable inputs. All of the outputs are HIGH unless G1 is HIGH and G2 is LOW. The ALS137 is ideally suited for implementing glitch-free decoders in strobed (stored-address) applications in bus-oriented systems. Features s Combines decoder and 3-bit address latch s Incorporates 3 enable inputs to simplify cascading s Low power dissipation: 28 mW typ s Switching specifications guaranteed over full temperature and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process Ordering Code: Order Number DM74ALS137M DM74ALS137N Package Number M16A N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Connection Diagram Function Table Inputs Enable GL G1 G2 C X X L L L L L L L L H X L H H H H H H H H H H X L L L L L L L L L X X L L L L H H H H X Select B X X L L H H L L H H X Outputs A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X L H L H L H L H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L X Output corresponding to stored address, L; all others, H L = LOW State H = HIGH State X = Don't Care (c) 2000 Fairchild Semiconductor Corporation DS006202 www.fairchildsemi.com DM74ALS137 Logic Diagram www.fairchildsemi.com 2 DM74ALS137 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 75.5C/W 104.0C/W 7V 7V 0C to +70C -65C to +150C 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 Symbol VCC VIH VIL IOH IOL tW tSU tH TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Width of Enabling Pulse Setup Time (Note 2) Hold Time (Note 2) Free Air Operating Temperature GL LOW A, B, C A, B, C 10 10 5 0 70 Parameter Min 4.5 2 0.8 -0.4 8 Nom 5 Max 5.5 Units V V V mA mA ns ns ns C Note 2: The arrow () indicates the positive edge of the GL input pulse is used for reference. Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH VOL II IIH IIL IO ICC Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current @ Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current VCC = 5.5V VIH = 7V VCC = 5.5V VIH = 2.7V VCC = 5.5V VIL = 0.4V VCC = 5.5V, VO = 2.25V VCC = 5.5V IOH = -0.4 mA VCC = 4.5V to 5.5V VCC = 4.5V IOL = 4 mA IOL = 8 mA Enable A, B, C Enable A, B, C Enable A, B, C -30 5 Conditions VCC = 4.5V, II = -18 mA VCC - 2 0.25 0.35 0.4 0.5 0.1 0.1 20 20 -0.1 -0.1 -112 11 Min Typ Max -1.5 Units V V V V mA A mA mA mA 3 www.fairchildsemi.com DM74ALS137 Switching Characteristics over recommended operating free air temperature range. Symbol tPLH Parameter Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output Conditions VCC = 4.5V to 5.5V RL = 500 CL = 50 pF From (Input) To (Output) A, B, C 5 to Y A, B, C 6 to Y G2 4 to Y G2 5 to Y G1 5 to Y G1 5 to Y GL 7 to Y GL 7 to Y 20 ns 22 ns 15 ns 17 ns 15 ns 12 ns 20 ns 20 ns Min Max Units www.fairchildsemi.com 4 DM74ALS137 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A 5 www.fairchildsemi.com DM74ALS137 3 to 8 Line Decoder/Demultiplexer with Address Latches Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16E 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 reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 6 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com |
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