IDT71342 Integrated Device Technology, IDT71342 Datasheet
IDT71342
Available stocks
Related parts for IDT71342
IDT71342 Summary of contents
Page 1
... Features ◆ High-speed access – Commercial: 20/25/35/45/55/70ns (max.) – Industrial: 25/35/55ns (max.) ◆ Low-power operation – IDT71342SA Active: 700mW (typ.) Standby: 5mW (typ.) – IDT71342LA Active: 700mW (typ.) Standby: 1mW (typ.) Functional Block Diagram R I SEM 11L © ...
Page 2
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore Description The IDT71342 is a high-speed Dual-Port Static RAM with full on-chip hardware support of semaphore signalling between the two ports. The IDT71342 provides two independent ports with separate control, address, and I/O pins that permit independent, asynchronous access for reads or writes to any location in memory ...
Page 3
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore Absolute Maximum Ratings Symbol Rating (2) V Terminal Voltage TERM with Respect to GND Temperature T BIAS Under Bias Storage T STG Temperature (3) P Power T Dissipation DC Output I OUT Current NOTES: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device ...
Page 4
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore DC Electrical Characteristics Over the Operating Temperature and Supply Voltage Range Symbol Parameter Dynamic Operating Current CC (Both Ports Active) Outputs Disabled SEM = Don't Care MAX CE and CE I Standby Current SB1 L SEM (Both Ports - TTL ...
Page 5
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore Data Retention Characteristics (LA Version Only 0.2V Symbol Parameter V V for Data Retention Data Retention Current CCDR (3) t Chip Deselect to Data Retention Time CDR (3) t Operation Recovery Time R NOTES 2V +25°C, and are not production tested. ...
Page 6
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore AC Electrical Characteristics Over the Operating Temperature and Supply Voltage Symbol Parameter READ CYCLE t Read Cycle Time RC t Address Access Time AA (3) t Chip Enable Access Time ACE t Output Enable Access Time AOE t Output Hold from Address Change ...
Page 7
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore Timing Waveform of Read Cycle No. 1, Either Side ADDRESS DATA PREVIOUS DATA VALID OUT Timing Waveform of Read Cycle No. 2, Either Side t SOP ( SEM t SOP OE DATA OUT CURRENT I SB NOTES: 1. Timing depends on which signal is asserted last CE. ...
Page 8
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore AC Electrical Characteristics Over the Operating Temperature Supply Voltage Symbol Parameter WRITE CYCLE t Write Cycle Time WC t Chip Enable to End-of-Write EW t Address Valid to End-of-Write AW t Address Set-up Time AS t Write Pulse Width ...
Page 9
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore TIMING WAVEFORM OF WRITE CYCLE NO CONTROLLED TIMING ADDRESS ( SEM R DATA OUT DATA IN Timing Waveform of Write Cycle No Controlled Timing ADDRESS ( SEM ( R/W DATA IN NOTES must be HIGH during all address transitions. ...
Page 10
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore Timing Waveform of Semaphore Read After Write Timing, Either Side VALID ADDRESS SEM DATA R/W OE NOTE for the duration of the above timing (both write and read cycle). ...
Page 11
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore FUNCTIONAL DESCRIPTION The IDT71342 is an extremely fast Dual-Port CMOS Static RAM with an additional 8 address locations dedicated to binary semaphore flags. These flags allow either processor on the left or right side of the Dual-Port RAM to claim a privilege over the other processor for functions defined by the system designer’ ...
Page 12
... Left Port Writes "1" to Semaphore NOTE: 1. This table denotes a sequence of events for only one of the eight semaphores on the IDT71342. 2. There are eight semaphore flags written to via I VIH, SEM = VIL to access the semaphores. Refer to the semaphore Read/Write Control Truth Table. ...
Page 13
... Using Semaphores–Some examples Perhaps the simplest application of semaphores is their application as resource markers for the IDT71342’s Dual-Port RAM. Say the RAM was to be divided into two blocks which were to be dedicated at any one time to servicing either the left or right port. ...
Page 14
... IDT71342SA/LA High-Speed Dual-Port Static RAM with Semaphore Ordering Information IDT XXXX A 999 Device Type Power Speed Datasheet Document History 1/12/99: Initiated datasheet document history Converted to new format Cosmetic and typographical corrections Added additional notes to pin configurations 6/9/99: Changed drawing format 10/1/99: Added Industrial Temperature Ranges and removed corresponding notes ...