IS61LF51236A-7.5TQLI-TR ISSI, Integrated Silicon Solution Inc, IS61LF51236A-7.5TQLI-TR Datasheet - Page 21

• Manufacturer Part Number: IS61LF51236A-7.5TQLI-TR
• Description: IC SRAM 18MBIT 7.5NS 100TQFP
• Manufacturer: ISSI, Integrated Silicon Solution Inc

Specifications of IS61LF51236A-7.5TQLI-TR

• Format - Memory: RAM
• Memory Type: SRAM - Synchronous
• Memory Size: 18M (512K x 36)
• Speed: 7.5ns
• Interface: Parallel
• Voltage - Supply: 3.135 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IS61LF25672A
IS61VF25672A
IEEE 1149.1 SERIAL BOUNDARY SCAN (JTAG)
The IS61LF/VF51236A and IS61LF/VF102418A have a
serial boundary scan Test Access Port (TAP) in the PBGA
package only. This port operates in accordance with IEEE
Standard 1149.1-1900, but does not include all functions
required for full 1149.1 compliance. These functions from
the IEEE specification are excluded because they place
added delay in the critical speed path of the SRAM. The
TAP controller operates in a manner that does not conflict
with the performance of other devices using 1149.1 fully
compliant TAPs. The TAP operates using JEDEC stan-
dard 2.5V I/O logic levels.
DISABLING THE JTAG FEATURE
The SRAM can operate without using the JTAG feature.
To disable the TAP controller, TCK must be tied LOW
(Vss) to prevent clocking of the device. TDI and TMS are
internally pulled up and may be disconnected. They may
alternately be connected to V
TDO should be left disconnected. On power-up, the de-
vice will start in a reset state which will not interfere with the
device operation.
TAP CONTROLLER BLOCK DIAGRAM
Integrated Silicon Solution, Inc.
Rev. K
07/29/2010
TMS
TCK
TDI
Selection Circuitry
TAP CONTROLLER
IS61LF51236A
IS61VF51236A IS61VF102418A
DD
through a pull-up resistor.
31 30 29
0
2
x
Bypass Register
Instruction Register
Identification Register
Boundary Scan Register*
1
. . . . .
0
IS61LF102418A
. . .
TEST ACCESS PORT (TAP) - TEST CLOCK
The test clock is only used with the TAP controller. All
inputs are captured on the rising edge of TCK and outputs
are driven from the falling edge of TCK.
TEST MODE SELECT (TMS)
The TMS input is used to send commands to the TAP
controller and is sampled on the rising edge of TCK. This
pin may be left disconnected if the TAP is not used. The pin
is internally pulled up, resulting in a logic HIGH level.
TEST DATA-IN (TDI)
The TDI pin is used to serially input information to the
registers and can be connected to the input of any register.
The register between TDI and TDO is chosen by the
instruction loaded into the TAP instruction register. For
information on instruction register loading, see the TAP
Controller State Diagram. TDI is internally pulled up and
can be disconnected if the TAP is unused in an application.
TDI is connected to the Most Significant Bit (MSB) on any
register.
2
2
1
1
0
0
Selection Circuitry
TDO
21