Rev. 1.4 / July 2006

14

HY5PS12821(L)F

HY5PS121621(L)F

3.3 Output Buffer Characteristics

3.3.1 Output AC Test Conditions

3.3.2 Output DC Current Drive

3.3.3 OCD default characteristics

Note 1: Absolute Specifications (0°C

Note 2: Impedance measurement condition for output source dc current: VDDQ = 1.7V; VOUT = 1420mV;

(VOUT-VDDQ)/Ioh must be less than 23.4 ohms for values of VOUT between VDDQ and VDDQ-280mV.

Impedance measurement condition for output sink dc current: VDDQ = 1.7V; VOUT = 280mV; VOUT/Iol

must be less than 23.4 ohms for values of VOUT between 0V and 280mV.

Note 3: Mismatch is absolute value between pull-up and pull-dn, both are measured at same temperature and

voltage.

Note 4: Slew rate measured from vil(ac) to vih(ac).

Note 5: The absolute value of the slew rate as measured from DC to DC is equal to or greater than the slew

rate as measured from AC to AC. This is guaranteed by design and characterization.

Note 6: This represents the step size when the OCD is near 18 ohms at nominal conditions across all process

corners/variations and represents only the DRAM uncertainty. A 0 ohm value(no calibration) can only be

achieved if the OCD impedance is 18 ohms +/- 0.75 ohms under nominal conditions.

Symbol

Parameter

SSTL_18 Class II

Units

Notes

Output Timing Measurement Reference Level

V1

1. The VDDQ of the device under test is referenced.

Symbol

Parameter

SSTl_18

Units

Notes

Output Minimum Source DC Current

- 13.4

mA

1, 3, 4

Output Minimum Sink DC Current

13.4

mA

2, 3, 4

1.

mV.

2.

3.

4.

actual current values are derived by shifting the desired driver operating point (see Section 3.3) along a 21 ohm load line to define

a convenient driver current for measurement.

Description

Parameter

Min

Nom

Max

Unit

Notes

Output impedance

12.6

18

23.4

ohms

1,2

Output impedance step size for OCD cali-

bration

0

1.5

ohms

6

Pull-up and pull-down mismatch

0

4

ohms

1,2,3

Output slew rate

Sout

1.5

-

5

V/ns

1,4,5,6,7,8