======================================================================== 74F289 64-BIT RANDOM ACCESS MEMORY (WITH OPEN-COLLECTOR OUTPUTS) ======================================================================== Family: Fairchild FAST (Advanced Schottky TTL) Source: 1980 Fairchild FAST Data Book, pages 4-91 ... 4-93 Status: PRELIMINARY -- page 4-91 carries a "Preliminary" watermark. Ratings: Vcc = +5.0 V +/-5%, TA = 0 to +70 deg C DESCRIPTION ----------- The 'F289 is a high speed 64-bit RAM organized as a 16-word by 4-bit array. Address inputs are buffered to minimize loading, and addresses are fully decoded on-chip. Outputs are open-collector type and are in the off (HIGH) state whenever the Chip Select (/CS) input is HIGH. The outputs are active only in the Read mode; output data is the complement of the stored data. o Open-collector outputs for wired-AND applications o Buffered inputs minimize loading o Address decoding on-chip o Diode clamped inputs minimize ringing CONNECTION DIAGRAM (16-pin DIP) ------------------------------- Pin Function Pin Function --- ------------------------------ --- --------------------------- 1 A0 Address input 0 16 Vcc 2 /CS Chip Select (active LOW) 15 A1 Address input 1 3 /WE Write Enable (active LOW) 14 A2 Address input 2 4 D1 Data input 1 13 A3 Address input 3 5 /O1 Inverted data output 1 12 D4 Data input 4 6 D2 Data input 2 11 /O4 Inverted data output 4 7 /O2 Inverted data output 2 10 D3 Data input 3 8 GND 9 /O3 Inverted data output 3 FUNCTION TABLE -------------- /CS /WE Operation Condition of Outputs --- --- --------- ------------------------- L L Write Off (HIGH) L H Read Complement of Stored Data H X Inhibit Off (HIGH) H = HIGH voltage level; L = LOW voltage level; X = immaterial. INPUT LOADING / FAN-OUT ----------------------- Pin Names Description U.L. HIGH/LOW --------- ------------------------------- ------------- A0 - A3 Address Inputs 0.5 / 0.375 /CS Chip Select Input (Active LOW) 0.5 / 0.375 /WE Write Enable Input (Active LOW) 0.5 / 0.375 D1 - D4 Data Inputs 0.5 / 0.375 /O1 - /O4 Inverted Data Outputs OC (1) / 12.5 (1) OC -- Open Collector. An external pull-up resistor is required; the ac table specifies RL = 280 ohms for the published timings. DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE --------------------------------------------------- Symbol Parameter Min Typ Max Units Conditions ------ -------------------- --- --- --- ----- ------------------------- ICC Power Supply Current 43 mA Vcc = Max; /WE, /CS = Gnd AC CHARACTERISTICS ------------------ Symbol Parameter Min Typ Max Units ------ ---------------------------------- --- --- --- ----- tPLH Access Time, HIGH (1) -- An to /On -- 20 -- ns tPHL Access Time, LOW (1) -- An to /On -- 20 -- ns tPHL Access Time (1) -- /CS to /On -- 12 -- ns tPLH Disable Time (1) -- /CS to /On -- 12 -- ns tPHL Recovery Time (1) -- /WE to /On -- 12 -- ns tPLH Disable Time (1) -- /WE to /On -- 12 -- ns (1) Measured with RL = 280 ohms. The data sheet carried a superscript 1 on every row except Recovery Time, which carried an asterisk; both markers denote the same condition. AC OPERATING REQUIREMENTS ------------------------- Symbol Parameter Min Typ Max Units ------ ----------------------------- --- --- --- ----- ts (H) Setup Time, HIGH -- An to /WE 0 -- -- ns ts (L) Setup Time, LOW -- An to /WE 0 -- -- ns th (H) Hold Time, HIGH -- An to /WE 0 -- -- ns th (L) Hold Time, LOW -- An to /WE 0 -- -- ns ts (H) Setup Time, HIGH -- Dn to /WE 20 -- -- ns ts (L) Setup Time, LOW -- Dn to /WE 20 -- -- ns th (H) Hold Time, HIGH -- Dn to /WE 0 -- -- ns th (L) Hold Time, LOW -- Dn to /WE 0 -- -- ns ts (L) Setup Time, LOW -- /CS to /WE -- -- -- ns th (L) Hold Time, LOW -- /CS to /WE -- -- -- ns tw (L) /WE Pulse Width LOW 20 -- -- ns