1 - Al Kossow's Bitsavers

TMS46648192·WORD BY 8·BIT READ·ONL Y MEMORYelectrical characteristics, T A5 V ± 10% (unless otherwise noted)PARAMETER TEST CONDITIONS MIN MAX UNITVOH High-level output voltage Vce=4.5 V, IOH= -400 p.A 2.4 VVOL Low-level output voltage Vee-4.5 V, IOL-3.2 mA 0.4 VII Input current Vee=5.5 V, OVSVINS5.5 V 10 p.A10 Output leakage current VO=0.4 V to Vee, Chip deselected ±10 p.AleCl Supply current from Vee (active) Vee=5.5 V, VI=Vec output not loaded 80 mAei Input capacitanceVO-O V, TA-25 o e.f= 1 MHz6 pFCo Output capacitanceVO=O v.f=l MHzTA=25 o e.12 pFswitching characteristics, T A 5 V ± 10%, 2 series 74 TTL loads, CL 100 pFtPARAMETER MIN MAX UNITtalA) Access time from address 1: 450 nsta(S) Access time from chip select+ 200 nstv(A) Output data valid after address change 20 nstdis Output disable time from chip select 150 nstAli AC measurements are made at 10% and 90% points* Access time from page select is double normal access time.NOTE 1: All address changes must be made within 30 ns of when the first address changes to prevent address skewing.read cycle timingAO-AllEtS01-08I:::~----.................... --------..... --..... ------..... --..... ~~~--------------..J l.-I I tv(A) I I--~:-~\i_ I I I:I ~I ______________________________"""'~:-J: I-----~ t'IAI ¢1---' ~ tdisI ---t ta(S) ~ I IVAL'DIIW-enQ)(.)'SQ)c~oa:PROGRAMMING DATAPROGRAMMING REQUIREMENTS: The TMS4664 NL is a fixed program memory in which the programming is performedby TI at the factory during the manufacturing cycle to the specific customer inputs supplied in the format below. The deviceis organized as 8192 8-bit words with address locations numbered 0 to 8191. The 8-bit words can be coded as a 2-digithexadecimal number between 00 and FF. All data words and addresses in the following format are coded in hexadecimalnumbers. In coding all binary words must be in positive logic before conversion to hexadecimal. Q1 is considered the leastsignificant bit and Q8 the most significant bit. For addresses. AO is least significant bit and A 11 is the most significant.The input media containing the programming data can be in the form of cards or EPROMs.Either 16K, 32K, or 64K EPROMs ·can be used or any combination of them.The following is a description of how the cards must be formatted, should they be used instead of EPROMs.84TEXASINSTRUMENTSPOST OFFICE BOX 225012 • OALLAS. TEXAS 752657-3