Am8228 Am8238 System Controller and Bus Driver for 8080A Compatible Microprocessors Distinctive Characteristics Multi-byte instruction interrupt acknowledge Selectable single level vectored interrupt (RST-7) 28-pin molded or hermetic DIP package Single chip system controller and data bus driver for Am9080/8080A systems Am8238-4 high speed version available for use with Tusec instruction cycle of Am9080A-4 Bi-directional three-state bus driver for CPU indepen- dent operation @ Advanced low-power Schottky processing Available in military and commercial range @ Am8238 has extended iOW/MEMW pulse width temperature FUNCTIONAL DESCRIPTION The Am8228 and Am8238 are single chip System Controller Data Bus drivers for the Am9080A Microcomputer System. They generate ail control signals required to directly interface Am9080A/8080A compatible system circuits (memory and 1/0) to the CPU. LOGIC SYMBOL Bi-directional bus drivers with three-state outputs are provided 18 =} g HOLA DBIN WR og, 8 bane: 17 =e] 0, 08, ~ for the system data bus, facilitating CPU independent bus o, 8, n Operations such as direct memory access. Interrupt pracessing 10 03 Bl. DB, 9 is accommodated by means of a single vectored interrupt or Bm eo, BIESRONAY op Lee 5 by means of the standard 8080A multiple byte interrupt vector 19 ~1D5 DB 18 operation. 21 = 1Dg OBgp-e 20 8 ~e/0, 0B, 7 CONTROL iNTAJO 23 LOGIC DIAGRAM . MEM RO 24 1 =-oF STATUS MEM WlO 26 Dy OB, HQ R{O* 25 a, 0B, 22 BUSEN VO WiOe= 27 Dy DBy CPU Y 5 og. | SYSTEM oaray aus barven pa, [ous Ds OB, 6 Be Vee = Pin 28 D> By GND = Pin 14 LIC-629 DRIVER CONTROL + MENA CONNECTION DIAGRAM Top View STATUS MEM W LATCH Ton aang ers CJ 701 Yee STB ven Hoa [_] 2 27 [_] ow DBIN BUSEN wa (]3 2e [_] MENW WR HLDA inTA cain [ J 4 25 [_] oR LIC-628 084 [_]5 2 (7) ENR 0, (Js 23 [77] iNTA ORDERING INFORMATION a bey (_]7 Amez28 22 [] aUsEN Am8238 D B 2t Oo Am8228 Am8238 7 Is Package Temperature Order Order DB; CC] 9 20 C_] DBg Numb Type - Range - Number umber 03 C40 19 [7 og Molded DIP 0 C to +70C AM8228PC AM8238PC Hermetic DIP = OC to #70C ~= D8 228 D8238 8, (1 i Hermetic DIP -55C to +125C ~=AM8228DM AM8238DM o) Cy vp Dice 0C to +70C AM8228XC AM8238XC Hermetic DIP OC to. +70C AM8238-4DC* 08 [J 13 16 [7] 8; Molded DIP OC to. +70C AMB238-4PC* eno Fie sf] >> *For use with Am9080A-4 with minimum clock period of 250ns. Note: Pin 1 is marked for orientation. LIC-630