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MCM63R836FC3.0 Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MCM63R836FC3.0 Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 21 page MCM63R836 •MCM63R918 9 MOTOROLA FAST SRAM The table of timing values shows either a minimum or a maximum limit for each parameter. Input requirements are specified from the external system point of view. Thus, address setup time is shown as a minimum since the system must supply at least that much time. On the other hand, responses from the memory are specified from the device point of view. Thus, the access time is shown as a maximum since the device never provides data later than that time. TIMING LIMITS DEVICE UNDER TEST ZQ 50 Ω 50 Ω 0.75 V VDDQ/2 Vref 250 Ω Figure 1. Test Loads 50 Ω 50 Ω 0.75 V 0.75 V 50 Ω 50 Ω 5 pF 5 pF 16.7 Ω DQ 16.7 Ω 16.7 Ω 0.75 V a. Test Load b. Test Load AC INPUT CHARACTERISTICS (See Note 1) Parameter Symbol Min Max Notes AC Input Logic High (See Figure 4) VIH (ac) Vref + 200 mV — AC Input Logic Low (See Figures 2 and 4) VIL (ac) — Vref – 200 mV 2 Input Reference Peak to Peak ac Voltage Vref (ac) — 5% Vref (dc) 3 Clock Input Differential Voltage Vdif (ac) 400 mV VDDQ + 500 mV 4 NOTES: 1. Inputs may overshoot to 3.3 V for up to 35% tKHKH or 1.0 ns, whichever is smaller, and 3.8 V instantaneous peak overshoot. See Figure 2. 2. Inputs may undershoot to VSS – 1.0 V for up to 35% tKHKH or 1.0 ns, whichever is smaller, and VSS – 1.5 V instantaneous peak undershoot. See Figure 2. 3. Although considerable latitude in the selection of the nominal dc value (i.e., rms value) of Vref is supported, the peak to peak ac component superimposed on Vref may not exceed 5% of the dc component of Vref. 4. Minimum instantaneous differential input voltage required for differential input clock operation. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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