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5 / 10 page STK12C68-M 4-57 Note e: These parameters guaranteed but not tested. Note n: HSB is an I/O that has a weak internal pullup; it is basically an open drain output. It is meant to allow up to 32 STK12C68-Ms to be ganged together for simultaneous storing. Do not use HSB to pullup any external circuitry other than other STK12C68-M HSB pins. Note o: A RECALL cycle is initiated automatically at power up when V CC exceeds VSWITCH. tRECALL is measured from the point at which VCC exceeds 4.5V. 22 tRECALL RECALL Cycle Duration 20 µs Note o 23 tSTORE tHLHH STORE Cycle Duration 10 ms VCC ≥ 4.5V 24 tDELAY tHLQZ HSB Low to Inhibit On 1 µs 25 t RECOVER t HHQX HSB High to Inhibit Off 300 ns Note e 26 t ASSERT t HLHX External STORE Pulse Width 250 ns Note e VSWITCH Low Voltage Trigger Level 4.0 4.5 V IHSB_OL HSB Output Low Current 3 mA HSB = VOL, Note e, n IHSB_OH HSB Output High Current 5 60 µA HSB = VIL, Note e, n NONVOLATILE MEMORY OPERATION MODE SELECTION H X H X Not Selected Output High Z Standby L H H X Read SRAM Output Data Active l L L H X Write SRAM Input Data Active L H H 0000 Read SRAM Output Data Active k,l 1555 Read SRAM Output Data k,l 0AAA Read SRAM Output Data k,l 1FFF Read SRAM Output Data k,l 10F0 Read SRAM Output Data k,l 0F0F Nonvolatile STORE Output High Z k L H H 0000 Read SRAM Output Data Active k,l 1555 Read SRAM Output Data k,l 0AAA Read SRAM Output Data k,l 1FFF Read SRAM Output Data k,l 10F0 Read SRAM Output Data k,l 0F0E Nonvolatile RECALL Output High Z k XX L X STORE/Inhibit Output High Z ICC /Standby m E W HSB A12 - A0(hex) MODE I/O POWER NOTES Note k: The six consecutive addresses must be in order listed - (0000, 1555, 0AAA, 1FFF, 10F0, 0F0F) for a STORE cycle or (0000, 1555, 0AAA, 1FFF, 10F0, 0F0E) for a RECALL cycle. W must be high during all six consecutive cycles. See STORE cycle and RECALL cycle tables and diagrams for further details. Note l: I/O state assumes that G ≤ V IL. Activation of nonvolatile cycles does not depend on the state of G. Note m: HSB initiated STORE operation actually occurs only if a WRITE has been done since last STORE operation. After the STORE (if any) completes, the part will go into standby mode inhibiting all operation until HSB rises. HARDWARE STORE /RECALL SYMBOLS NO. PARAMETER MIN MAX UNITS NOTES 2 HSB W RECALL STORE SRAM Inhibit Software STORE HSB Initiated STORE Power Down STORE Brown Out RECALL Power Up RECALL VSWITCH VCAP 24 tDELAY 26 tASSERT 22 tRECALL 24 tDELAY 25 tRECOVER 23 tSTORE 23 tSTORE 23 tSTORE HARDWARE STORE /RECALL |
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