www.ams.com

Revision 1.0

11 - 20

AS8202B

Datasheet - Detailed Descr i p ti on

Notes:

1. Prior to starting a read or write access, CEB, WEB and OEB have to be stable for at least 5 ns (see symbol 3, 4, 8, 9). In addition the

designer has to consider the minimum inactivity time according to symbols 16, 17, 18, 19. For more information on the inactivity times

(see Figure 3).

2. To allow proper internal initialization, after finishing any write access (CEB or WEB is high) to the internal CONTROLLER_ON register,

CEB OEB and WEB have to be stable high within 200 ns (min = 8 Tc).

3. All values not tested during production, guaranteed by design.

Figure 3. Read/Write Access Inactivity Time

17

Read to Write Access Inactivity Time

(CEB, OEB low to CEB, WEB low)

5

(see note 1)

ns

18

Write to Write Access Inactivity Time

(CEB, WEB low to CEB, WEB low)

5

(see note 1,2)

ns

19

Write to Read Access Inactivity Time

(CEB, WEB low to CEB, OEB low)

5

(see note 1,2)

ns

Table 5. Asynchronous DPRAM Interface

Symbol

Parameter

Conditions

Min

Typ

Max

Units

CEB

WEB

OEB

16

Read

Read

18

Write

17

Write

19

Read