AS4C64M8D2 datasheet(22/59 Pages) ALSC

22 / 59 page

AS4C64M8D2

Confidential

Rev. 1.0

Feb. /2014

Table 20. AC overshoot/undershoot specification for clock, data, strobe, and mask pins

(DQ, DQS, DQS#, DM, CK, CK#)

Parameter

-25

-3

Unit

Maximum peak amplitude allowed for overshoot area

0.5

Maximum peak amplitude allowed for undershoot area

0.5

Maximum overshoot area above VDD

0.23

V-ns

Maximum undershoot area below VSS

0.23

V-ns

Table 21. Output AC test conditions (VDD = 1.8V  0.1V, TOPER = 0~95 C)

Symbol

Parameter

Value

Unit Note

VOTR

Output timing measurement reference level

0.5xVDDQ

NOTE1: The VDDQ of the device under test is referenced.

Table 22. Output DC current drive (VDD = 1.8V  0.1V, TOPER = 0~95 C)

Symbol

Parameter

Value

Unit Note

IOH(dc)

Output minimum source DC current

-13.4

mA 1, 3, 4

IOL(dc)

Output minimum sink DC current

13.4

mA 2, 3, 4

NOTE1: VDDQ = 1.7 V; VOUT = 1420 mV. (VOUT - VDDQ) /IOH must be less than 21 Ω for values of VOUT between VDDQ

and VDDQ - 280 mV.

NOTE2: VDDQ = 1.7 V; VOUT = 280 mV. VOUT/IOL must be less than 21 Ω for values of VOUT between 0 V and 280 mV.

NOTE3: The dc value of VREF applied to the receiving device is set to VTT

NOTE4: The values of IOH (dc) and IOL (dc) are based on the conditions given in Notes 1 and 2. They are used to test

device drive current capability to ensure VIH min plus a noise margin and VIL max minus a noise margin are

delivered to an SSTL_18 receiver. The actual current values are derived by shifting the desired driver

operating point (see JEDEC standard: Section 3.3 of JESD8-15A) along a 21 Ω load line to define a

convenient driver current for measurement.

Table 23. Capacitance (VDD = 1.8V, f = 1MHz, TOPER = 25 C)

Symbol

Parameter

Value

Unit

Min.

Max.

CIN

Input Capacitance : Command and Address

1.0

1.75

CCK

Input Capacitance (CK, CK#)

1.0

2.0

CI/O

DM, DQ, DQS Input/Output Capacitance

2.5

3.5

DCIN

Delta Input Capacitance: Command and Address

0.25

DCCK

Delta Input Capacitance: CK, CK#

0.25

DCIO

Delta Input/Output Capacitance: DM, DQ, DQS

0.5

NOTE: These parameters are periodically sampled and are not 100% tested.

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