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IDT71V25781S183BQI Datasheet(PDF) 2 Page - Integrated Device Technology |
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IDT71V25781S183BQI Datasheet(HTML) 2 Page - Integrated Device Technology |
2 / 23 page 6.42 2 IDT71V25761, IDT71V25781, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with 2.5V I/O, Pipelined Outputs, Burst Counter, Single Cycle Deselect Commercial and Industrial Temperature Ranges Symbol Pin Function I/O Active Description A0-A17 Address Inputs I N/A Synchronous Address inputs. The address register is trig gered by a combination of the rising edge of CLK and ADSC Low or ADSP Low and CE Low. ADSC Address Status (Cache Controller) I LOW Synchronous Address Status from Cache Controller. ADSC is an active LOW input that is used to load the address registers with new addresses. ADSP Address Status (Processor) I LOW Synchronous Address Status from Processor. ADSP is an active LOW input that is used to load the address registers with new addresses. ADSP is gated by CE. ADV Burst Address Advance I LOW Synchronous Address Advance. ADV is an active LOW input that is used to advance the internal burst counter, controlling burst access after the initial address is loaded. When the input is HIGH the burst counter is not incremented; that is, there is no address advance. BWE Byte Write Enable I LOW Synchronous byte write enable gates the byte write inputs BW1-BW4. If BWE is LOW at the rising edge of CLK then BWx inputs are passed to the next stage in the circuit. If BWE is HIGH then the byte write inputs are blocked and only GW can initiate a write cycle. BW1-BW4 Individual Byte Write Enables I LOW Synchronous byte write enables. BW1 controls I/O0-7, I/OP1, BW2 controls I/O8-15, I/OP2, etc. Any active byte write causes all outputs to be disabled. CE Chip Enable I LOW Synchronous chip enable. CE is used with CS0 and CS1 to enable the IDT71V25761/781. CE also gates ADSP. CLK Clock I N/A This is the clock input. All timing references for the device are made with respect to this input. CS0 Chip Select 0 I HIGH Synchrono us active HIGH chip select. CS0 is used with CE and CS1 to enable the chip. CS1 Chip Select 1 I LOW Synchronous active LOW chip select. CS1 is used with CE and CS0 to enable the chip. GW Global Write Enable I LOW Synchronous global write enable. This input will write all four 9-bit data bytes when LOW on the rising edge of CLK. GW supersedes individual byte write enables. I/O0-I/O31 I/OP1-I/OP4 Data Input/Output I/O N/A Synchro nous data input/output (I/O) pins. Both the data input path and data output path are registered and triggered by the rising edge of CLK. LBO Linear Burst Order I LOW Asynchronous burst order selection input. When LBO is HIGH, the interleaved burst sequence is selected. When LBO is LOW the Linear burst sequence is selected. LBO is a static input and must not change state while the device is operating. OE Output Enable I LOW Asynchronous output enable. When OE is LOW the data output drivers are enabled on the I/O pins if the chip is also selected. When OE is HIGH the I/O pins are in a high- impedance state. VDD Power Supply N/A N/A 3.3V core power supply. VDDQ Power Supply N/A N/A 2.5V I/O Supply. VSS Ground N/A N/A Ground. NC No Connect N/A N/A NC pins are not electrically connected to the device. ZZ Sleep Mode I HIGH Asynchro nous sleep mode input. ZZ HIGH will gate the CLK internally and power down the IDT71V25761/781 to its lowest p ower consumption level. Data retention is guaranteed in Sleep Mode. 5297 tbl 02 Pin Definitions(1) NOTE: 1. All synchronous inputs must meet specified setup and hold times with respect to CLK. |
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