GS4288C09 datasheet(39/62 Pages) GSI

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Recommended DC Operating Conditions and Electrical Characteristics

Description

Conditions

Symbol

Min.

Max.

Unit

Notes

Supply Voltage

—

VEXT

2.38

2.63

—

Supply Voltage

—

VDD

1.7

1.9

Isolated Output Buffer Supply

—

VDDQ

1.4

VDD

2, 3

Reference Voltage

—

VREF

0.49 * VDDQ

0.51 * VDDQ

4, 5, 6

Termination Voltage

—

VTT

0.95 * VREF

1.05 * VREF

7, 8

Input High (logic 1) voltage

—

VIH(DC)

VREF + 0.1

VDDQ + 0.3

Input Low (logic 0) voltage

—

VIL(DC)

VSS – 0.3

VREF – 0.1

Ouput High Current

VOUT = VDDQ/2

IOH

(VDDQ/2)/(1.15 * RQ/5)

(VDDQ/2)/(0.85 * RQ/5)

9, 10, 11

Ouput Low Current

VOUT = VDDQ/2

IOL

(VDDQ/2)/(1.15 * RQ/5)

(VDDQ/2)/(0.85 * RQ/5)

9, 10, 11

Clock Input Leakage Current

0 V

 VIN VDD

ILC

–5

A

—

Input Leakage Current

0 V

 VIN VDD

ILI

–5

A

—

Output Leakage Current

0 V

 VIN VDDQ

ILO

–5

A

—

Reference Voltage Current

—

IREF

–5

A

—

Notes:

1. All voltages referenced to VSS (GND). This note applies to the entire table.

2. Overshoot VIH(AC)  VDD+ 0.7 V for t  tCK/2. Undershoot: VIL(AC)  –0.5 V for t  tCK/2. During normal operation VDDQ must not exceed

VDD. Control input signals may not have pulse widthts less than tCK/2 or operate at frequencies exceeding tCK (MAX).

3. VDDQ can be set to a nominal 1.5 V ± 0.1 V or 1.8 V ± 0.1 V supply.

4. Typically the value of VREF is expected to be 0.5 * VDDQ of the transmitting device. VREF is expected to track variations in VDDQ.

5. Peak-to-Peak AC noise on VREF must not exceed ±2% of VREF(DC).

6. VREF is expected to equal VDDQ/2 of the transmitting device and to track variations in the DC level of the same. Peak-to-peak noise 

(non-common mode) on VREF may not exceed ±2% of the DC value. Thus, from VDDQ/2, VREF is allowed ±2% VDDQ/2 for DC error and an

addtional ±2% VDDQ/2 for AC noise. This measurement is to be taken at the nearest VREF bypass capacitor.

7. VTT is expected to be set equal to VREF and must track variations in the DC level of VREF.

8. On-die termination may be selected using Mode Register Bit 9 (M9). A resistance RTT from each data input signal to the nearest VTT can be

enabled. RTT = 125–185at 95° C TC.

9. IOH and IOL are defined as absolute values and are measured at VDDQ/2. IOH flows from the device, IOL flows into the device.

10. If Mode Register Bit 8 (M8) is 0, use RQ = 250

in the equation in lieu of presence of an external impedance matched resistor.

11. For VOL and VOH, refer to the LLDRAM II IBIS models.

GS4288C09/18/36L

Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.

Rev: 1.03 7/2014

39/62

GS4288C09 Datasheet(PDF) 39 Page - GSI Technology

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