emc643sp16ak Emlsi Inc., emc643sp16ak Datasheet - Page 25

• Manufacturer Part Number: emc643sp16ak
• Description: 4mx16 Bit Cellularram Ad-mux
• Manufacturer: Emlsi Inc.

Drive Strength (BCR[5:4]) Default = Outputs Use Half-Drive Strength
The output driver strength can be altered to full, one-half, or one-quarter strength to adjust for different data bus loading scenarios. The
reduced-strength options are intended for stacked chip (Flash + CellularRAM) environments when there is a dedicated memory bus. The
reduced-drive-strength option minimizes the noise generated on the data bus during READ operations. Full output drive strength should
be selected when using a discrete CellularRAM device in a more heavily loaded data bus environment. Outputs are configured at half-
drive strength during testing. See Table 4 for additional information.
Table 4: Drive Strength
BCR[5]
0
0
1
1
BCR[4]
0
1
0
1
Drive Strength
(default)
Full
1/2
1/4
25
Impedance Typ (Ω )
25~30
100
50
Reserved
4Mx16 CellularRAM AD-MUX
EMC643SP16AK
Use Recommendation
104 MHz at light load
CL = 15pF or lower
CL = 30pF to 50pF
CL = 15pF to 30pF