Electronic Components Datasheet Search |
|
HMNR1288DV-70I Datasheet(PDF) 8 Page - Hanbit Electronics Co.,Ltd |
|
HMNR1288DV-70I Datasheet(HTML) 8 Page - Hanbit Electronics Co.,Ltd |
8 / 14 page HANBit HMNR1288D(V) URL : www.hbe.co.kr 8 HANBit Electronics Co.,Ltd Rev. 1.0 (April, 2002) Data Retention Mode With valid VCC applied, the HMNR1288D(V) operates as a conventional Bytewide static RAM. Should the supply voltage decay, the RAM will automatically deselect, write protecting itself when VCC falls between VPFD (max), VPFD (min) window. All outputs become high impedance and all inputs are treated as “Don't care.” Note : A power failure during a WRITE cycle may corrupt data at the current addressed location, but does not jeopardize the rest of the RAM's content. At voltages below VPFD (min), the memory will be in a write protected state, provided the VCC fall time is not less than tF. The HMNR1288D(V) may respond to transient noise spikes on VCC that cross into the deselect window during the time the device is sampling VCC. Therefore, decoupling of the power supply lines is recommended. When VCC drops below VSO, the control circuit switches power to the internal battery, preserving data and powering the clock. The internal energy source will maintain data in the HMNR1288D(V) for an accumulated period of at least 10 years at room temperature. As system power rises above VSO, the battery is disconnected, and the power supply is switched to external VCC . Write protection continues until VCC reaches VPFD (min) plus tREC (min). Normal RAM operation can resume tREC after VCC exceeds VPFD (max). Figure 5. Power Down/Up Mode AC Waveforms Power Down/Up AC Characteristics Symbol Parameter Min Max Unit tF (2) VPFD (max) to VPFD (min) VCC Fall Time 300 uS HMNR1288D 10 uS tFB (3) VPFD (min) to VSS VCC Fall Time HMNR1288DV 150 uS tR VPFD (min) to VPFD (max) VCC Rise Time 10 uS tREC (4) VPFD (max) to RST High 40 200 uS tRB VSS to VPFD (min) VCC Rise Time 5 uS Note : 1. Valid for Ambient Operating Temperature: TA = 0 to 70° C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted). 2. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200 µs after VCC passes VPFD (min). 3. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data. |
Similar Part No. - HMNR1288DV-70I |
|
Similar Description - HMNR1288DV-70I |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |