Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
M27C405-90K1TR Datasheet(PDF) 9 Page - STMicroelectronics |
|
M27C405-90K1TR Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 15 page AI00760B n= 0 Last Addr VERIFY E = 100 µs Pulse ++n =25 ++ Addr VCC = 6.25V, VPP = 12.75V FAIL CHECK ALL BYTES 1st: VCC =6V 2nd: VCC = 4.2V YES NO YES NO YES NO Figure 7. Programming Flowchart PRESTO II Programming Algorithm PRESTO II Programming Algorithm allows the whole array to be programmed with a guaranteed margin, in a typical time of 52.5 seconds.Program- ming with PRESTO II consists of applying a se- quence of 100 µs programpulses to each byte until a correct verify occurs (see Figure 7). During pro- gramming and verify operation, a MARGIN MODE circuit is automaticallyactivated in order to guaran- tee that each cell is programmed with enough margin. No overprogram pulse is applied since the verify in MARGIN MODE provides the necessary margin to each programmed cell. Program Inhibit Programming of multiple M27C405s in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M27C405 may be common. A TTL low level pulse appliedto a M27C405’sE input,with VPP at 12.75V, will program that M27C405. A high level E input inhibits the other M27C405s from being pro- grammed. Program Verify A verify (read) should be performed on the pro- grammed bits to determine that they were correctly programmed. The verify is accomplished with G at VIL , E at VIH,VPP at 12.75V and VCC at 6.25V. On-Board Programming Programming the M27C405 may be performed directly in the application circuit, however this re- quires modification to the PRESTO II Algorithm (see Figure 8). For in-circuit programming VCC is determined by the user and normally is compatible with other components using the same supply volt- age. It is recommended that the maximum value of VCC which remains compatible with the circuit is used. Typically VCC=5.5V for programming systems us- ing VCC=5V is recommended. The value of VCC does not affect the programming, it gives a higher test capability in VERIFY mode. VPP must be kept at 12.75 volts to maintain and enable the programming. AI01349 n= 0 Last Addr VERIFY ? E= 10 µs Pulse ++n =25 ++ Addr VPP = 12.75V FAIL CHECK ALL BYTES VPP =VCC YES NO YES NO YES NO SET MARGIN MODE E= 10 µs Pulse Figure 8. On-Board Programming Flowchart 9/15 M27C405 |
Número de pieza similar - M27C405-90K1TR |
|
Descripción similar - M27C405-90K1TR |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |