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9338 Dataheets PDF



Part Number 9338
Manufacturers National Semiconductor
Logo National Semiconductor
Description 8-Bit Multiple Port Register
Datasheet 9338 Datasheet9338 Datasheet (PDF)

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 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 Dual-In-Line Package .

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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 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 Dual-In-Line Package TL F 9794 – 1 Order Number 9338DMQB 9338FMQB or DM9338N See NS Package Number J16A N16E or W16A Pin Names A0–A2 DA B0–B2 C0–C2 CP SLE ZB ZC 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 FAST and TRI-STATE are registered trademarks of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 9794 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 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 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 Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA ts (H) ts (L) th (H) th (L) ts (H) ts (L) th (H) th (L) tw (H) tw (L) Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature Setup Time HIGH or LOW DA to CP Hold Time HIGH or LOW DA to CP Setup Time HIGH or LOW An to CP Hold Time HIGH or LOW An to CP CP Pulse Width HIGH or LOW b 55 Military Nom 5 Max 55 Min 4 75 2 08 b0 8 Commercial Nom 5 Max 5 25 Units V V 08 b0 8 45 2 V mA mA C ns ns ns ns ns 16 125 0 20 12 0 b8 0 16 70 20 12 0 b8 0 10 10 0 0 23 13 10 10 0 0 23 13 Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOS Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Input Current Input Voltage Max Conditions VCC e Min II e b12 mA VCC e Min IOH e Max VIL e Max VCC e Min IOL e Max VIH e Min VCC e Max VI e 5 5V VCC e Max VI e 2 4V VCC e Max VI e 0 4V VCC e Max (Note 2) VCC e Max MIL COM b 10 b 10 Min Typ (Note 1) Max b1 5 Units V V 24 34 02 04 1 27 b1 1 b 70 b 70 V mA mA mA mA mA High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current ICC 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 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 Min tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay Bn or Cn to Zn Propagation Delay DA to Zn Propagation Delay CP to Zn 9338 (MIL) Max 40 35 45 50 35 30 DM9338 (COM) Min 13 18 25 25 18 13 Max 40 35 45 50 35 30 ns ns ns Units Functional Description 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 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 parall.


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