48kHz, single codec configuration, unless otherwise noted. Limits apply for T

otherwise specified. (Continued)

Symbol

Parameter

Conditions

LM4550

Units

(Limits)

Typical

(Note 7)

Limit

(Note 8)

T

FALL

Fall Time

BIT_CLK, SYNC, SDATA_IN or

SDATA_OUT

6

nS (max)

T

RST_LOW

RESET# active low pulse width

For cold reset

1.0

µS (min)

T

RST2CLK

RESET# inactive to BIT_CLK start up

For cold reset

162.8

nS (min)

T

SH

SYNC active high pulse width

For warm reset

1.3

µS

T

SYNC2CLK

SYNC inactive to BIT_CLK start up

For warm reset

162.8

nS (min)

T

SU2RST

Setup to trailing edge of RESET#

For ATE Test Mode

15

nS (min)

T

RST2HZ

Rising edge of RESET# to Hi-Z

For ATE Test Mode

25

nS (max)

Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.

Note 2: These specifications are guaranteed by design and characterization; they are not production tested.

Note 3: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which

guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit

is given, however, the typical value is a good indication of device performance.

The typical junction-to-ambient thermal resistance is 74˚C/W for package number VBH48A.

Note 5: Human body model, 100 pF discharged through a 1.5 k

Ω resistor.

Note 6: Machine Model, 220 pF–240 pF discharged through all pins.

Note 7: Typicals are measured at 25˚C and represent the parametric norm.

Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

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