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HM64YGB36100 Datasheet(PDF) 5 Page - Renesas Technology Corp

Part # HM64YGB36100
Description  32M Synchronous Late Write Fast Static RAM (1-Mword36-bit)
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HM64YGB36100 Datasheet(HTML) 5 Page - Renesas Technology Corp

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HM64YGB36100 Series
Rev.1.00 Jun 27, 2005 page 5 of 19
Programmable Impedance Output Drivers
Output buffer impedance can be programmed by terminating the ZQ pin to VSS through a precision resistor (RQ). The
value of RQ is five times the output impedance desired. The allowable range of RQ to guarantee impedance matching
with a tolerance of 15% is 250
Ω typical. If the status of ZQ pin is open, output impedance is maximum value.
Maximum impedance also occurs with ZQ connected to VDDQ. The impedance update of the output driver occurs when
the SRAM is in high-Z. Write and deselect operations will synchronously switch the SRAM into and out of high-Z,
therefore will trigger an update. At power up, the output buffer is in high-Z. It will take 4,096 cycles for the impedance
to be completely updated.
Absolute Maximum Ratings
Parameter
Symbol
Rating
Unit
Notes
Input voltage on any pin
VIN
−0.5 to VDDQ + 0.5
V
1, 4
Core supply voltage
VDD
−0.5 to +3.13
V
1
Output supply voltage
VDDQ
−0.5 to +2.1
V
1, 4
Operating temperature
TOPR
0 to +85
°C
Storage temperature
TSTG
−55 to +125
°C
Output short-circuit current
IOUT
25
mA
Latch up current
ILI
200
mA
Package junction to top thermal resistance
θJ-top
6.5
°C/W
5
Package junction to board thermal resistance
θJ-board
12
°C/W
5
Notes: 1. All voltage is referenced to VSS.
2. Permanent device damage may occur if absolute maximum ratings are exceeded. Functional operation
should be restricted the operation conditions. Exposure to higher voltages than recommended voltages for
extended periods of time could affect device reliability.
3. These CMOS memory circuits have been designed to meet the DC and AC specifications shown in the
tables after thermal equilibrium has been established.
4. The following supply voltage application sequence is recommended: VSS, VDD, VDDQ, VREF then VIN.
Remember, according to the absolute maximum ratings table, VDDQ is not to exceed 2.1 V, whatever the
instantaneous value of VDDQ.
5. See figure below.
θJ-top
Thermocouple
Thermo grease
Water
Cold plate
SRAM
Teflon block
JEDEC/2S2P
BGA
Thermal board
Thermocouple
Thermo grease
Water
Cold plate
SRAM
Teflon block
JEDEC/2S2P
BGA
Thermal board
θJ-board
Water
Water


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