9338

9338 NSC | Alldatasheet

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9338/DM9338 8-Bit Multiple Port Register June 1989 9338/DM9338 8-Bit Multiple Port Register General Description The DM9338 is an 8-bit multiple port register designed for high speed random access memory applications where the ability to simultaneously read and write is desirable. A com- mon use would be as a register bank in a three address computer. Data can be written into any one of the eight bits and read from any two of the eight bits simultaneously. Connection Diagrams Dual-In-Line Package TL/F/9794–1 Order Number 9338DMQB, 9338FMQB or DM9338N See NS Package Number J16A, N16E or W16A Pin Names Description A0–A2 Write Address Inputs DA Data Input B0–B2 B Read Address Inputs C0–C2 C Read Address Inputs CP Clock Pulse Input (Active Rising Edge) SLE Slave Enable Input (Active LOW) ZB B Output ZC C Output FASTÉ and TRI-STATE É are registered trademarks of National Semiconductor Corporation. C1995 National Semiconductor Corporation RRD-B30M115/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 Military b55§Ct o a125§C Commercial 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 Military Commercial 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 b0.8 b0.8 mA IOL Low Level Output Current 16 16 mA TA Free Air Operating Temperature b55 125 0 70 §C ts (H) Setup Time HIGH or LOW 20 20 nsts (L) D A to CP 12 12 th (H) Hold Time HIGH or LOW 0 0 nsth (L) D A to CP b8.0 b8.0 ts (H) Setup Time HIGH or LOW 10 10 nsts (L) A n to CP 10 10 th (H) Hold Time HIGH or LOW 0 0 nsth (L) A n to CP 0 0 tw (H) CP Pulse Width HIGH or LOW 23 23 nstw (L) 13 13

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 Voltage V CC e Min, I OH e Max 2.4 3.4 VVIL e Max VOL Low Level Output Voltage V CC e Min, I OL e Max 0.2 0.4 VVIH e Min 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 27 mA IIL Low Level Input Current V CC e Max, V I e 0.4V b1.1 mA IOS Short Circuit V CC e Max MIL b10 b70 mAOutput Current (Note 2) COM b10 b70 ICC Supply Current V CC e Max 135 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.

VCC ea 5.0V, T A ea 25§C (See Section 1 for waveforms and load configurations) CL e 15 pF Symbol Parameter 9338 (MIL) DM9338 (COM) Units Min Max Min Max tPLH Propagation Delay 40 13 40 nstPHL Bn or C n to Z n 35 18 35 tPLH Propagation Delay 45 25 45 nstPHL DA to Z n 50 25 50 tPLH Propagation Delay 35 18 35 nstPHL CP to Z n 30 13 30 Functional Description The 9338 8-bit multiple port register can be considered a 1- bit slice of eight high speed working registers. Data can be written into any one and read from any two of the eight locations simultaneously. Master/slave operation eliminates all race problems associated with simultaneous read/write activity from the same location. When the clock input (CP) is LOW data applied to the data input line (D A) enters the selected master. This selection is accomplished by coding the three write input select lines (A0–A2) appropriately. Data is stored synchronously with the rising edge of the clock pulse. The information for each of the two slaved (output) latches is selected by two sets of read address inputs (B0–B2 and C0–C2). The information enters the slave while the clock is HIGH and is stored while the clock is LOW. If Slave Enable is LOW (SLE ), the slave latches are continuously enabled. The signals are available on the output pins (Z B and Z C). The input bit selection and the two output bit selections can be accomplished independently or simultaneously. The data flows into the device, is demultiplexed according to the state of the write address lines and is clocked into the selected latch. The eight latches function as masters and store the input data. The two output latches are slaves and hold the data during the read operation. The state of each slave is determined by the state of the master selected by its associ- ated set of read address inputs. The method of parallel expansion is shown in Figure a . One 9338 is needed for each bit of the required word length. The read and write input lines should be connected in common on all of the devices. This register configuration provides two words of n-bits each at one time, where n devices are connected in parallel. Logic Symbol TL/F/9794–2 VCC e Pin 16 GND e Pin 8 TL/F/9794–4 FIGURE a. Parallel Expansion

TL/F/9794–3

Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 9338DMQB 16-Lead Molded Dual-In-Line Package (N) Order Number DM9338N

9338/DM9338 8-Bit Multiple Port Register Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 9338FMQB 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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