cl Am27821/27S21A Advanced Micro 1,024-Bit (256x4) Bipolar PROM Devices DISTINCTIVE CHARACTERISTICS @ High speed @ Low-current PNP inputs Highly reliable, ultra-fast programming Platinum-Silicide @ High-current open-collector and three-state outputs fuses @ Fast chip select @ High programming yield GENERAL DESCRIPTION The Am27S21 (256 words by 4-bits) is a Schottky TTL power Schattky bus standards capable of satisfying the Programmable Read-Only Memory (PROM). requirements of a variety of microprogrammable controls, mapping functions, code version, or logic replacement. This device is only available in a three-state (Am27S21) Easy word-depth expansion is facilitated by active LOW (Gi output version. These outputs are compatible with low- and Gg) output enables. BLOCK DIAGRAM ar me As C11 OF 18 LN 16 x 64 As p>] Ro y PROGRAMMABLE Aa DECODER ARRAY u u u ab Ag Ae co 412 16 > AL oS COLUMN 4-1 of 16 MULTIPLEXERS A DECODER eo ae a) Qa a3 BD006390: PRODUCT SELECTOR GUIDE Three-State Part Number Am27S21A Am27S21 sadress Access 30 ns 40 ns 45 ns 60 ns Operating R c M Cc M Publicafion# Rev. Amendment 03206 D 0 Issue Date: January 1969 5-73CONNECTION DIAGRAMS Top View DIPs* Lec** a Cy wl] Mec s (J2 wi] Ay % Cis uf) a (js c) 4 Cis 2) 2, a (je nL} a, a: C7 ef) a, ano (_]s ef) 2,5 Cp000581 *Also available in a 16-Pin Fiatpack. Pinout identical to DIPs. **Also available in a 20-Pin Square PLCC. Pinout identical to LCC. Note: Pin 1 is marked for orientation. LOGIC SYMBOL L$000081 5-74 Am27S21/27S21AORDERING INFORMATION Standard Products AMD standard products are availabie in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of: a. Device Number b. Speed Option (if applicable) c. Package Type d. Temperature Range e. Optional Processing AM27S21_ A a2 g& & |, OPTIONAL PROCESSING Blank = Standard processing 8 = Burn-in d. TEMPERATURE RANGE C =Commercial (0 to + 75C) . PACKAGE TYPE P = 16-Pin Piastic DIP (PD 016) D = 16-Pin Ceramic DIP (CD 016) L =20-Pin Ceramic Leadless Chip Carrier (CL 020) J = 20-Pin Plastic Leaded Chip Carrier (PL 020) b. SPEED OPTION A=30 ns Blank = 45 ns a. DEVICE NUMBER/DESCRIPTION Am27S21/Am27S21A 1,024-Bit (256 x 4) Bipolar PROM Valid Combinations Valid Combinations AMaTSEI Valid Combinations list configurations planned to be DG, DOB, FO. pes. supported in volume for this device. Consult the local AMD AM27S21A aan sates office to contirm availability of specific valid combinations, to check on newly released combinations, and to obtain additional data on AMD's standard military grade products. Am27$21/27S21A -75MILITARY ORDERING INFORMATION APL Products AMD products for Aerospace and Defense applications are available in several packages and operating ranges. APL (Approved Products List) products are fully compliant with MIL-STD-883C requirements. The order number (Valid Combination) for APL products is formed by a combination of: a. Device Number b. Speed Option (if applicable) c. Device Class d. Package Type e. Lead Finish AM27S21 A /B A L_. LEAD FINISH A= Hot Solder Dip d. PACKAGE TYPE E = 16-Pin Ceramic DIP (CD 016) F = 16-Pin Flatpack (CF 016) 2=20-Pin Ceramic Leadiess Chip Carrier (CL 020) c. DEVICE CLASS /B = Class B b. SPEED OPTION A=40 ns Blank = 60 ns a. DEVICE NUMBER/DESCRIPTION Am27S21/Am27S21A 1,024-Bit (256 x 4) Bipolar PROM Valid Combinations Vaild Combinations AM27S21 /BEA, /BFA, /B24 Valid Combinations list configurations pianned to be AM27S21A supported in volume for this device. Consult the local AMD sales office to confirm availability of specific valid combinations or to check for newly released valid combinations. Group A Tests Group A tests consist of Subgroups 1, 2, 3, 7, 8, 9, 10, 11. MILITARY BURN-IN Military burn-in is in accordance with the current revision of MIL-STD-883, Test Method 1015, Conditions A through E. Test conditions are selected at AMD's option. 5-76 Am27S21/27S21APIN DESCRIPTION Ao-A7 Address inputs (inputs) The 8-bit field presented at the address inputs selects one of 256 memory focations to be read from. Qo-Qg Data Output Port (Outputs) The output whose state represents the data read from the selected memory locations. G;, G2 Output Enable Provides direct control of the Q output buffers. Outputs disabled force all open-collector outputs to an OFF state and all three-state outputs to a floating or high-impedance state. Enable = G1 Go Disable = Gy-Ga =G;,+Go Vcc Device Power Supply Pin The most positive of the logic power supply pins. GND Device Power Supply Pin The most negative of the logic power supply pins. FUNCTIONAL DESCRIPTION Applying The Am27S21 Typical application of the Am27S21 is shown below. The Am27S21 is employed as mapping ROMs in a microprogram computer controf unit. The eight-bit macroinstruction from main memory is brought into the Ag A7 inputs of the mapping ROM array. The instruction is mapped into a 12-bit address space with each PROM output supplying 4 bits. The 12 bits of address are then supplied to the ''D' inputs of the Am2910 as a possible next address source for microprogram memory. The MAP output of the Am2910 is connected to the Gy input of the Am27S21 such that when the Gj input is HIGH, the outputs of the PROMs are in the three-state mode in the case of the Am27S21. The Go input is grounded; thus data from other sources are free to drive the D inputs of the Am2910 when MAP is HIGH. OTHER OATA INPUTS 2? MEMORY ADORESS Oy % Os O% Dy Dp Dy 2 AF000232 Figure 1. Microprogramming Instruction Mapping Am27S21/27S21A 5-77ABSOLUTE MAXIMUM RATINGS OPERATING RANGES Storage Temperature ...............-- eee eee ~65 to + 150C Commercial (C) Devices Ambient Temperature with Ambient Temperature (Ta)...........-...0.006 0 to +75C Power Applied ......00... eee eneee -55 to +125C Supply Voltage (Vcc) +4.75 V to +5.25 V Supply Voltage ................ 0c eece cece -0.5 V to +7.0 V a oe DG Voltage Applied to Outputs we Gene Tomporatare (TC) 0. eee cccnee eee -55 to + 125C (Except During Programming)....... -0.5 V to +Voc Max. Supply Volt Vv +45 V to +55 V DC Voltage Applied to Outputs upply Voltage (Voc) .-...--cceeeeeeee . io . During Pi HQ oes cc eeeee cece eeeeeerenneeaaeee a1V Output Current into Outputs During Operating ranges define those limits between which the Programming (Max. Duration of 4 sec) ............ 250 mA functionality of the device is guaranteed. DC input Voltage ............c cc ceeeec eee eee -0.5 V to +55 V DC Input Current -30 mA to +5 mA Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. *Military product 100% tested at Tc +25C, +125C, and -55C. DC CHARACTERISTICS over operating ranges unless otherwise specified (for APL Products, Group A, Subgroups 1, 2, 3 are tested unless otherwise noted) Parameter Parameter Symbol Description Test Conditions Min. Typ. Max. Unit Voc = Min., lon =-2.0 mA Vou (Note 1) Output HIGH Voltage Vin'= Vin or Vib 2.4 v Vee = Min., lo. = 16 mA Vor Output LOW Voltage ViN'= Vin oF Vib 0.45 v Guaranteed input logical HIGH ViH Input HIGH Level voltage for all inputs (Note 2) 2.0 v Guaranteed input logical LOW Vit Input LOW Level voltage for all inputs (Note 2) 08 v lit Input LOW Current Voc = Max., Vin = 0.45 V -0.250 mA li Input HIGH Current Voc = Max., Vin = 2.7 V 25 BA Isc (Note 1) Output Short Circuit Current Vec = Max., Vout = 0.0V {Note 3) -20 -90 mA Icc Power Supply Current vee Max GND, 130 mA vi input Clamp Voltage Voc = Min., lin =-18 mA -1.2 v Voc = Max., Vo * Voc 40 { Output Leakage Current Note 1 ICEX tp ge VG, =24V ( ) Vo=04 V 7) HA Cin Input Capacitance Voc = 5.00 V., Ta = 25C 4 F Cour Output Capacitance Vin/Vout = 2.0 V.@ f= 1 MHz (Note 4) 8 P Notes: 1. This applies to three-state devices only. . Vi_ and ViH are input conditions of output tests and are not themselves directly tested. V4, and Vi are absolute voltages with respect to device ground and include all overshoots due to system and/or tester noise. Do not attempt to test these values without suitable equipment. . Not more than one output should be shorted at a time. Duration of the short circuit should not be more than one second. . These parameters are not 100% tested, but are evaluated at initial characterization and at any time the design is modified where capacitance may be affected. aw 5-78 Am27S21/27S21ASWITCHING CHARACTERISTICS over operating ranges unless otherwise specified (for APL Products, Group A, Subgroups 9, 10, 11 are tested unless otherwise noted) Am27S21A Am27S21 cOM'L Mit COM'L MIL Parameter Parameter No. Symbol Description Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. Unit 1 TAVaV Address Valid to Output Valid Access Time 30 40 45 60 ns 2 TGVQZ Delay from Output Enable Valid to Output Hi-Z 20 25 20 30 ns 3 TGVOQV Delay from Output Enable Vatid to Output Valid 20 25 20 30 ns See also Switching Test Circuits. Notes: 1. Tests are performed with input tran: A under Switching Test Circuits. 2. TGVQZ is measured at steady state HIGH output 8 under Switching Test Circuits. *Subgroups 7 and 8 apply to functional tests. sition time of 5 ns.or tess, timing reference levels of 1.5 V, and input pulse levels of 0 to 3.0 V using test toad in voltage - 0.5 V and steady state LOW output voltage + 0.5 V output levels using the test load in SWITCHING TEST CIRCUITS , S.0V 5.0V 1 1 Si Sy 300 300 Cutput Output SO pF $602 SpF $6oD TC003460 TC003470 A. Output Load for all tests except FGVQZ B. Output Load for TGVQZ Notes: 1. Ali device test loads should be located within 2 of device output pin. 2. $1 is open for Output Data HIGH to Hi-Z and Hi-Z to Output Data HIGH tests. S1 is closed for ail other AC tests. 3. Load capacitance includes all stray and fixture capacitance. Am27S21/27S21A 5-79cme ROC OUTPUTS aq - os a+ SWITCHING WAVEFORMS KEY TO SWITCHING WAVEFORMS WAVEFORM eS 2 | dNPUTS OUTPUTS: MUST BE WILL BE STEADY . STEADY may cuance Mit Se FROM H TOL FROM H TOL WILL BE MAY CHANGE CHANGING FROML TOH FROML TOH DONT CARE, CHANGING; ANY CHANGE STATE PERMITTED UNKNOWN CENTER DOES NOT LINE 1S HIGH APPLY WMPEDANCE OFF STATE kKS000010 OOOO / RR) VALID ADDRESS ERK WF021170 Am27S25/27S25A/27S25SA