9338,DM9338 9338/DM9338 8-Bit Multiple Port Register Literature Number: SNOS383A 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 common 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 et e Dual-In-Line Package TL/F/9794 – 1 ol Order Number 9338DMQB, 9338FMQB or DM9338N See NS Package Number J16A, N16E or W16A Pin Names Description Write Address Inputs Data Input B Read Address Inputs C Read Address Inputs Clock Pulse Input (Active Rising Edge) Slave Enable Input (Active LOW) B Output C Output O bs A0–A2 DA B0–B2 C0–C2 CP SLE ZB ZC FASTÉ and TRI-STATEÉ are registered trademarks of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/9794 RRD-B30M115/Printed in U. S. A. 9338/DM9338 8-Bit Multiple Port Register June 1989 Absolute Maximum Ratings (Note) 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. 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 b 55§ C to a 125§ C Military Commercial 0§ C to a 70§ C Storage Temperature Range b 65§ C to a 150§ C Recommended Operating Conditions Military Parameter Units 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 IOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature ts (H) ts (L) Setup Time HIGH or LOW DA to CP 20 12 th (H) th (L) Hold Time HIGH or LOW DA to CP b 8.0 ts (H) ts (L) Setup Time HIGH or LOW An to CP 10 10 th (H) th (L) Hold Time HIGH or LOW An to CP 0 0 tw (H) tw (L) CP Pulse Width HIGH or LOW 2 2 0.8 V b 0.8 mA 16 mA 70 §C e 0.8 16 b 55 V V b 0.8 125 0 20 12 0 ns 0 ns b 8.0 10 10 ns 0 0 ns 23 13 ns ol 23 13 bs Electrical Characteristics Commercial Min et Symbol Over recommended operating free air temperature range (unless otherwise noted) Symbol Conditions Input Clamp Voltage VCC e Min, II e b12 mA VOH High Level Output Voltage VCC e Min, IOH e Max VIL e Max VOL Low Level Output Voltage VCC e Min, IOL e Max VIH e Min II Input Current @ Max Input Voltage VCC e Max, VI e 5.5V IIH High Level Input Current IIL IOS O VI Parameter ICC Min 2.4 Typ (Note 1) Max Units b 1.5 V 3.4 0.2 V 0.4 V 1 mA VCC e Max, VI e 2.4V 27 mA Low Level Input Current VCC e Max, VI e 0.4V b 1.1 mA Short Circuit Output Current VCC e Max (Note 2) Supply Current VCC e Max MIL b 10 b 70 COM b 10 b 70 135 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. 2 mA mA Switching Characteristics VCC e a 5.0V, TA e a 25§ C (See Section 1 for waveforms and load configurations) CL e 15 pF Symbol Parameter 9338 (MIL) Min DM9338 (COM) Max Min Max Units tPLH tPHL Propagation Delay Bn or Cn to Zn 40 35 13 18 40 35 ns tPLH tPHL Propagation Delay DA to Zn 45 50 25 25 45 50 ns tPLH tPHL Propagation Delay CP to Zn 35 30 18 13 35 30 ns Functional Description data during the read operation. The state of each slave is determined by the state of the master selected by its associated 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. et e The 9338 8-bit multiple port register can be considered a 1bit 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 (DA) 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 (ZB and ZC). 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 ol Logic Symbol TL/F/9794 – 2 O bs VCC e Pin 16 GND e Pin 8 TL/F/9794 – 4 FIGURE a. Parallel Expansion 3 et e Logic Diagram O bs ol TL/F/9794 – 3 4 e Physical Dimensions inches (millimeters) O bs ol et 16-Lead Ceramic Dual-In-Line Package (J) Order Number 9338DMQB NS Package Number J16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM9338N NS Package Number N16E 5 e et 16-Lead Ceramic Flat Package (W) Order Number 9338FMQB NS Package Number W16A bs ol 9338/DM9338 8-Bit Multiple Port Register Physical Dimensions inches (millimeters) (Continued) LIFE SUPPORT POLICY O 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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