PDF STK17T88 Data sheet ( Hoja de datos )

Número de pieza	STK17T88
Descripción	32K x 8 AutoStore nvSRAM
Fabricantes	Simtek
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No Preview Available ! www.DataSheet4U.com FEATURES • nvSRAM Combined With Integrated Real-Time Clock Functions (RTC, Watchdog Timer, Clock Alarm, Power Monitor) • Capacitor or Battery Backup for RTC • 25, 45 ns Read Access & R/W Cycle Time • Unlimited Read/Write Endurance • Automatic Non-volatile STORE on Power Loss • Non-Volatile STORE Under Hardware or Soft- ware Control • Automatic RECALL to SRAM on Power Up • Unlimited RECALL Cycles • 200K STORE Cycles • 20-Year Non-volatile Data Retention • Single 3 V + 20%, -10% Power Supply • Commercial and Industrial Temperatures • Small Footprint SSOP Package (RoHS-Compli- ant) STK17T88 32K x 8 AutoStore nvSRAM DESCRIPTION The Simtek STK17T88 combines a 256Kb non-vola- tile static RAM (nvSRAM) with a full-featured real- time clock in a reliable, monolithic integrated circuit. The 256Kbit nvSRAM is a fast static RAM with a non-volatile Quantum Trap storage element included with each memory cell. The SRAM provides the fast access & cycle times, ease of use and unlimited read & write endurance of a normal SRAM. Data transfers automatically to the non-volatile storage cells when power loss is detected (the STORE operation). On power up, data is automatically restored to the SRAM (the RECALL operation). Both STORE and RECALL operations are also available under software control. The real time clock function provides an accurate clock with leap year tracking and a programmable, high accuracy oscillator. The Alarm function is pro- grammable for one-time alarms or periodic minutes, hours, or days alarms. There is also a programma- ble watchdog timer for processor control. BLOCK DIAGRAM A5 A6 A7 A8 A9 A11 A12 A13 A14 DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 Quantum Trap 512 X 512 STATIC RAM ARRAY 512 X 512 STORE RECALL COLUMN I/O COLUMN DEC A0 A1 A2 A3 A4 A10 This product conforms to specifications per the terms of Simtek standard warranty. The product has completed Simtek internal qualification testing and has reached production status. 1 VCC VCAP POWER CONTROL STORE/ RECALL CONTROL VRTCbat VRTCcap HSB SOFTWARE DETECT A13 – A0 RTC X1 X2 INT MUX A14 – A0 G E W Document Control #ML0024 Rev 1.7 March 2007 1 page RTC DC CHARACTERISTICS STK17T88 Symbol Parameter IBAK VRTCbat VRTCcap RTC Backup Current RTC Battery Pin Voltage RTC Capacitor Pin Voltage tOSCS RTC Oscillator time to start Commercial Min Max — 300 1.8 3.3 1.2 2.7 — 10 —5 Industrial Min Max — 350 1.8 3.3 1.2 2.7 — 10 —5 Units nA V V sec sec Notes From either VRTCcap or VRTCbat Typical = 3.0 Volts during normal operation Typical = 2.4 Volts during normal operation @ MIN Temperature from Power up or Enable @ 25°C from Power up or Enable RTC RECOMMENDED COMPONENT CONFIGURATION X1 X2 Recommended Values Y1 = 32.768 KHz RF = 10M Ohm C1 = 0 C2 = 56 pF Figure 3. RTC COMPONENT CONFIGURATION Document Control #ML0024 Rev 1.7 March 2007 5 5 Page MODE SELECTION STK17T88 EW HX LH LL LH LH G A13-A0 Mode I/O Power X X Not Selected Output High Z Standby L X Read SRAM Output Data Active X X Write SRAM Input Data Active 0x0E38 Read SRAM Output Data 0x31C7 Read SRAM Output Data L 0x03E0 0x3C1F Read SRAM Read SRAM Output Data Output Data 0x303F Read SRAM Output Data Active ICC2 0x0FC0 Nonvolatile Store Output High Z 0x0E38 Read SRAM Output Data 0x31C7 Read SRAM Output Data L 0x03E0 0x3C1F Read SRAM Read SRAM Output Data Output Data Active 0x303F Read SRAM Output Data 0x0C63 Nonvolatile Recall Output High Z Notes q,r,s q,r,s note q: The six consecutive addresses must be in the order listed. W must be high during all six consecutive cycles to enable a nonvolatile cycle. note r: While there are 15 addresses on the STK17T88, only the lower 13 are used to control software modes note s: I/O state depends on the state of G. The I/O table shown assumes G low Document Control #ML0024 Rev 1.7 March 2007 11 11 Page

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Número de pieza	Descripción	Fabricantes
STK17T88	32K x 8 AutoStore nvSRAM	Simtek

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